Afleveringen
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Want to quickly provision your autonomous database? Then look no further than Oracle Autonomous Database Serverless, one of the two deployment choices offered by Oracle Autonomous Database. Autonomous Database Serverless delegates all operational decisions to Oracle, providing you with a completely autonomous experience. Join hosts Lois Houston and Nikita Abraham, along with Oracle Database experts, as they discuss how serverless infrastructure eliminates the need to configure any hardware or install any software because Autonomous Database handles provisioning the database, backing it up, patching and upgrading it, and growing or shrinking it for you. Survey: https://customersurveys.oracle.com/ords/surveys/t/oracle-university-gtm/survey?k=focus-group-2-link-share-5 Oracle MyLearn: https://mylearn.oracle.com/ Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X (formerly Twitter): https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, Rajeev Grover, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started.
00:26
Lois: Hello and welcome to the Oracle University Podcast! Iām Lois Houston, Director of Innovation Programs with Oracle University, and with me is Nikita Abraham, Team Lead: Editorial Services.
Nikita: Hi everyone! We hope youāve been enjoying these last few weeks as weāve been revisiting our most popular episodes of the year.
Lois: Todayās episode is the last one in this series and is a throwback to a conversation on Autonomous Databases on Serverless Infrastructure with three experts in the field: Hannah Nguyen, Sean Stacey, and Kay Malcolm. Hannah is a Staff Cloud Engineer, Sean is the Director of Platform Technology Solutions, and Kay is Vice President of Database Product Management. For this episode, weāll be sharing portions of our conversations with them.
01:14
Nikita: We began by asking Hannah how Oracle Cloud handles the process of provisioning an
Autonomous Database. So, letās jump right in!Hannah: The Oracle Cloud automates the process of provisioning an Autonomous Database, and it automatically provisions for you a highly scalable, highly secure, and a highly available database very simply out of the box.
01:35
Lois: Hannah, what are the components and architecture involved when provisioning an Autonomous Database in Oracle Cloud?
Hannah: Provisioning the database involves very few steps. But it's important to understand the components that are part of the provisioned environment. When provisioning a database, the number of CPUs in increments of 1 for serverless, storage in increments of 1 terabyte, and backup are automatically provisioned and enabled in the database. In the background, an Oracle 19c pluggable database is being added to the container database that manages all the user's Autonomous Databases. Because this Autonomous Database runs on Exadata systems, Real Application Clusters is also provisioned in the background to support the on-demand CPU scalability of the service. This is transparent to the user and administrator of the service. But be aware it is there.
02:28
Nikita: Okā¦So, what sort of flexibility does the Autonomous Database provide when it comes to managing resource usage and costs, you knowā¦ especially in terms of starting, stopping, and scaling instances?
Hannah: The Autonomous Database allows you to start your instance very rapidly on demand. It also allows you to stop your instance on demand as well to conserve resources and to pause billing. Do be aware that when you do pause billing, you will not be charged for any CPU cycles because your instance will be stopped. However, you'll still be incurring charges for your monthly billing for your storage. In addition to allowing you to start and stop your instance on demand, it's also possible to scale your database instance on demand as well. All of this can be done very easily using the Database Cloud Console.
03:15
Lois: What about scaling in the Autonomous Database?
Hannah: So you can scale up your OCPUs without touching your storage and scale it back down, and you can do the same with your storage. In addition to that, you can also set up autoscaling. So the database, whenever it detects the need, will automatically scale up to three times the base level number of OCPUs that you have allocated or provisioned for the Autonomous Database.
03:38
Nikita: Is autoscaling available for all tiers?
Hannah: Autoscaling is not available for an always free database, but it is enabled by default for other tiered environments. Changing the setting does not require downtime. So this can also be set dynamically. One of the advantages of autoscaling is cost because you're billed based on the average number of OCPUs consumed during an hour.04:01
Lois: Thanks, Hannah! Now, letās bring Sean into the conversation. Hey Sean, I want to talk about moving an autonomous database resource. When or why would I need to move an autonomous database resource from one compartment to another?
Sean: There may be a business requirement where you need to move an autonomous database resource, serverless resource, from one compartment to another. Perhaps, there's a different subnet that you would like to move that autonomous database to, or perhaps there's some business applications that are within or accessible or available in that other compartment that you wish to move your autonomous database to take advantage of.
04:36
Nikita: And how simple is this process of moving an autonomous database from one compartment to another? What happens to the backups during this transition?
Sean: The way you can do this is simply to take an autonomous database and move it from compartment A to compartment B. And when you do so, the backups, or the automatic backups that are associated with that autonomous database, will be moved with that autonomous database as well.
05:00
Lois: Is there anything that I need to keep in mind when Iām moving an autonomous database between compartments?
Sean: A couple of things to be aware of when doing this is, first of all, you must have the appropriate privileges in that compartment in order to move that autonomous database both from the source compartment to the target compartment. In addition to that, once the autonomous database is moved to this new compartment, any policies or anything that's defined in that compartment to govern the authorization and privileges of that said user in that compartment will be applied immediately to that new autonomous database that has been moved into that new compartment.
05:38
Nikita: Sean, I want to ask you about cloning in Autonomous Database. What are the different types of clones that can be created?
Sean: It's possible to create a new Autonomous Database as a clone of an existing Autonomous Database. This can be done as a full copy of that existing Autonomous Database, or it can be done as a metadata copy, where the objects and tables are cloned, but they are empty. So there's no rows in the tables. And this clone can be taken from a live running Autonomous Database or even from a backup. So you can take a backup and clone that to a completely new database.
06:13
Lois: But why would you clone in the first place? What are the benefits of this?
Sean: When cloning or when creating this clone, it can be created in a completely new compartment from where the source Autonomous Database was originally located. So it's a nice way of moving one database to another compartment to allow developers or another community of users to have access to that environment.
06:36
Nikita: I know that along with having a full clone, you can also have a refreshable clone. Can you tell us more about that? Who is responsible for this?
Sean: It's possible to create a refreshable clone from an Autonomous Database. And this is one that would be synced with that source database up to so many days.
The task of keeping that refreshable clone in sync with that source database rests upon the shoulders of the administrator. The administrator is the person who is responsible for performing that sync operation. Now, actually performing the operation is very simple, it's point and click. And it's an automated process from the database console.
And also be aware that refreshable clones can trail the source database or source Autonomous Database up to seven days. After that period of time, the refreshable clone, if it has not been refreshed or kept in sync with that source database, it will become a standalone, read-only copy of that original source database.07:38
Nikita: Ok Sean, so if you had to give us the key takeaways on cloning an Autonomous Database, what would they be?
Sean: It's very easy and a lot of flexibility when it comes to cloning an Autonomous Database. We have different models that you can take from a live running database instance with zero impact on your workload or from a backup. It can be a full copy, or it can be a metadata copy, as well as a refreshable, read-only clone of a source database.
08:12
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08:50
Nikita: Welcome back! Thank you, Sean, and hi Kay! I want to ask you about events and notifications in Autonomous Database. Where do they really come in handy?
Kay: Events can be used for a variety of notifications, including admin password expiration, ADB services going down, and wallet expiration warnings. There's this service, and it's called the notifications service. It's part of OCI. And this service provides you with the ability to broadcast messages to distributed components using a publish and subscribe model. These notifications can be used to notify you when event rules or alarms are triggered or simply to directly publish a message.
In addition to this, there's also something that's called a topic. This is a communication channel for sending messages to subscribers in the topic. You can manage these topics and their subscriptions really easy. It's not hard to do at all.09:52
Lois: Kay, I want to ask you about backing up Autonomous Databases. How does Autonomous Database handle backups?
Kay: Autonomous Database automatically backs up your database for you. The retention period for backups is 60 days. You can restore and recover your database to any point in time during this retention period.
You can initiate recovery for your Autonomous Database by using the cloud console or an API call. Autonomous Database automatically restores and recovers your database to the point in time that you specify.
In addition to a point in time recovery, we can also perform a restore from a specific backup set.
10:37
Lois: Kay, you spoke about automatic backups, but what about manual backups?
Kay: You can do manual backups using the cloud console, for example, if you want to take a backup say before a major change to make restoring and recovery faster. These manual backups are put in your cloud object storage bucket.
10:58
Nikita: Are there any special instructions that we need to follow when configuring a manual backup?
Kay: The manual backup configuration tasks are a one-time operation. Once this is configured, you can go ahead, trigger your manual backup any time you wish after that. When creating the object storage bucket for the manual backups, it is really important-- so I don't want you to forget-- that the name format for the bucket and the object storage follows this naming convention. It should be backup underscore database name. And it's not the display name here when I say database name.
In addition to that, the object name has to be all lowercase. So three rules. Backup underscore database name, and the specific database name is not the display name. It has to be in lowercase. Once you've created your object storage bucket to meet these rules, you then go ahead and set a database property. Default_backup_bucket. This points to the object storage URL and it's using the Swift protocol. Once you've got your object storage bucket mapped and you've created your mapping to the object storage location, you then need to go ahead and create a database credential inside your database. You may have already had this in place for other purposes, like maybe you were loading data, you were using Data Pump, et cetera. If you don't, you would need to create this specifically for your manual backups. Once you've done so, you can then go ahead and set your property to that default credential that you created. So once you follow these steps as I pointed out, you only have to do it one time. Once it's configured, you can go ahead and use it from now on for your manual backups.13:00
Lois: Kay, the last topic I want to talk about before we let you go is Autonomous Data Guard. Can you tell us about it?
Kay: Autonomous Data Guard monitors the primary database, in other words, the database that you're using right now.
13:14
Lois: So, if ADB goes downā¦
Kay: Then the standby instance will automatically become the primary instance.
There's no manual intervention required. So failover from the primary database to that standby database I mentioned, it's completely seamless and it doesn't require any additional wallets to be downloaded or any new URLs to access APEX or Oracle Machine Learning. Even Oracle REST Data Services. All the URLs and all the wallets, everything that you need to authenticate, to connect to your database, they all remain the same for you if you have to failover to your standby database.
13:58
Lois: And what happens after a failover occurs?
Kay: After performing a failover, a new standby for your primary will automatically be provisioned. So in other words, in performing a failover your standby does become your new primary. Any new standby is made for that primary. I know, it's kind of interesting. So currently, the standby database is created in the same region as the primary database. For better resilience, if your database is provisioned, it would be available on AD1 or Availability Domain 1. My secondary, or my standby, would be provisioned on a different availability domain.
14:49
Nikita: But thereās also the possibility of manual failover, right? What are the differences between automatic and manual failover scenarios? When would you recommend using each?
Kay: So in the case of the automatic failover scenario following a disastrous situation, if the primary ADB becomes completely unavailable, the switchover button will turn to a failover button. Because remember, this is a disaster. Automatic failover is automatically triggered. There's no user action required. So if you're asleep and something happens, you're protected. There's no user action required, but automatic failover is allowed to succeed only when no data loss will occur.
For manual failover scenarios in the rare case when an automatic failover is unsuccessful, the switchover button will become a failover button and the user can trigger a manual failover should they wish to do so. The system automatically recovers as much data as possible, minimizing any potential data loss. But you can see anywhere from a few seconds or minutes of data loss. Now, you should only perform a manual failover in a true disaster scenario, expecting the fact that a few minutes of potential data loss could occur, to ensure that your database is back online as soon as possible.16:23
Lois: We hope youāve enjoyed revisiting some of our most popular episodes over these past few weeks. We always appreciate your feedback and suggestions so remember to take that quick survey weāve put out. Youāll find it in the show notes for todayās episode. Thanks a lot for your support. Weāre taking a break for the next two weeks and will be back with a brand-new season of the Oracle University Podcast in January. Happy holidays, everyone!
Nikita: Happy holidays! Until next time, this is Nikita Abraham...
Lois: And Lois Houston, signing off!
16:56
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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Redwood is a state-of-the-art graphical interface that defines the look and feel of the new Oracle Cloud Redwood Applications. In this episode, hosts Lois Houston and Nikita Abraham, along with Senior Principal OCI Instructor Joe Greenwald, take a closer look at the intent behind the design and development aspects of the new Redwood experience. They also explore Redwood page templates and components. Survey: https://customersurveys.oracle.com/ords/surveys/t/oracle-university-gtm/survey?k=focus-group-2-link-share-5 Developing Redwood Applications with Visual Builder: https://mylearn.oracle.com/ou/learning-path/developing-redwood-applications-with-visual-builder/112791 Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X (formerly Twitter): https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. --------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started.
00:26
Nikita: Hello and welcome to the Oracle University Podcast! Iām Nikita Abraham, Team Lead: Editorial Services with Oracle University, and with me is Lois Houston, Director of Innovation Programs.
Lois: Hi everyone! Thanks for joining us for this Best of 2024 series, where weāre playing for you our four most popular episodes of the year.
Nikita: Todayās episode is #3 of 4 and is a throwback to another conversation with Joe Greenwald, our Senior Principal OCI Instructor. We asked Joe about Oracleās Redwood design system and how it helps us create stunning, world-class enterprise applications and user experiences.01:04
Lois: Yeah, Redwood is the basis for all the new Oracle Cloud Applications being re-designed, developed, and delivered. Joe is the best person to ask about all of this because heās been working with our Oracle software development tools since the early 90s and is responsible for OUās Visual Builder Studio and Redwood course content. So, letās dive right in!
Joe: Hi Lois. Hi Niki. I am excited to join you on this episode because with the release of 24A Fusion applications, we are encouraging all our customers to adopt the new Redwood design system and components, and take advantage of the world-class look and feel of the new Redwood user experience.
Redwood represents a new approach and direction for us at Oracle, and weāre excited to have our customers benefit from it.
01:49
Nikita: Joe, youāve been working with Oracle user interface development tools and frameworks for a long time. How and why is Redwood different?
Joe: I joined Oracle in 1992, and the first Oracle user interface I experienced was Oracle Forms. And that was the character mode. I came from a background of Smalltalk and its amazing, pioneering graphical user interface (GUI) design capabilities. I worked at Apple and I developed my own GUIs for a few years on PCs and Macs. So, Character Mode Forms, what we used to call DMV (Department of Motor Vehicles) screens, was a shock, to say the least. Since then, Iāve worked with almost every user interface and development platform Oracle has created: Character Mode Forms, GUI Forms, Power Objects, HyperCard on the Macintosh, that was pre-OS X by the way, Sedona, written in native C++ and ActiveX and OLE, which didnāt make it to a product but appeared in other things later, ADF Faces, which uses Java to generate HTML pages, and APEX, which uses PL/SQL to generate HTML pages. And Iāve worked with and wrote training classes for Java Swing, an excellent GUI framework for event-driven desktop and enterprise applications, but it wasnāt designed for the web.
So, itās with pleasure that I introduce you to the Redwood design system, easily the best effort Iāve ever seen, from the look and feel of holistic user-goal-centered design philosophy and approach to the cutting-edge WYSIWYG design tools.
03:16
Lois: Joe, is Redwood just another set of styles, colors, and fonts, albeit very nice-looking ones?
Joe: The Redwood platform is new for Oracle, and it represents a significant change, not just in the look and feel, colors, fonts, and styles, I mean that too, but itās also a fundamental change in how Oracle is creating, designing, and imagining user interfaces.
As you may be aware, all Oracle Cloud Applications are being re-designed, re-engineered, and re-rebuilt from the ground up, with significant changes to both back-end and front-end architectures. The front end is being redesigned, re-developed, and re-created in pure HTML5, CSS3, and JavaScript using Visual Builder Studio and its design-time browser-based Integrated Development Environment. The back end is being re-architected, re-designed, and implemented in a modern microservice architecture for Oracle Cloud using Kubernetes and other modern technologies that improve performance and work better in the cloud than our current legacy architecture.
The new Oracle Cloud Applications platform uses Redwood for its design systemāits tools, its patterns, its components, and page templates. Redwood is a richer and more productive platform to create solutions while still being cost-effective for Oracle. It encourages a transformation of the fundamental user experience, emphasizing identifying, meeting, and understanding end usersā goals and how the applications are used.04:39
Nikita: Joe, do you think Oracle's user interface has been improved with Redwood? In what ways has the UI changed?
Joe: Yes, absolutely. Redwood has changed a lot of things. When I joined Oracle back in the '90s, there was effectively no user interface division or UI team. Everybody just did their own thing. There was no user interface labāand that was started in the mid-ā90sāand I was asked to give product usability feedback and participate in UI tests and experiments in those labs. I also helped test the products I was teaching at the time.
I actually distinctly remember having to take a week to train users on Oracleās Designer CASE tool product just to prep the participants enough to perform usability testing. I can still hear the UI lab manager shaking her head and saying any product that requires a week of training to do usability testing has usability issues! And if youāre like me and youāve been around Oracle long enough, you know that Oracleās not always been known for its user interfaces and been known to release products that look like they were designed by two or more different companies. All that has changed with Redwood.
With Redwood, thereās a new internal design group that oversees the design choices of all development teams that develop products. This includes a design system review and an ongoing audit process to ensure that all the products being released, whether Fusion apps or something else, all look and feel similar so it looks like itās designed by a single company with a single thought in mind. Which it is.Thereās a deeper, consistent commitment in identifying user needs, understanding how the applications are being used, and how they meet those user needs through things like telemetry: gathering metrics from the actual components and the Redwood system itself to see how the applications are being used, whatās working well, and what isnāt.
This telemetry is available to us here at Oracle, and we use it to fine tune the applicationsā usability and purpose.
06:29
Lois: Thatās really interesting, Joe. So, itās a fundamental change in the way weāre doing things. What about the GUI components themselves? Are these more sophisticated than simple GUI components like buttons and text fields?
Joe: The graphical components themselves are at a much higher level, more comprehensive, and work better together. And in Redwood, everything is a component. And Iām not just talking about things like input text fields and buttons, though it applies to these more fine-grained components as well. Leveraging Oracleās deep experience in building enterprise applications, weāve incorporated that knowledge into creating page templates so that the structure and look and feel of the page is fixed based on our internal design standards. The developer has control over certain portions of it, but the overall look and feel of the page is controlled by Oracle. So there is consistency of look and feel within and across applications.
These page templates come with predefined functionalities: headers, titles, properties, and variables to manipulate content and settings, slots for other components to hold like search fields, collections, contextual information, badges, and images, as well as primary and secondary actions, and variables for events and event handling through Visual Builder action chains, which handle the various actions and processing of the request on the page.And all these page templates and components are responsive, meaning they respond to the change in the size of the page and the orientation. So, when you move from a desktop to a handheld mobile device or a tablet, they respond appropriately and consistently to deliver a clean, easy-to-use interface and experience.
08:03
Nikita: You mentioned WYSIWYG design tools and their integration with Visual Builder Studioās integrated development environment. How does Redwood work with Visual Builder Studio?
Joe: This is easily one of my most favorite aspects about Redwood and the integration with Visual Builder Studio Designer. The components and page templates are responsive at runtime as well as responsive at design time! In over 30 years of working with Oracle software development products, this is the first development system and integrated development environment Iāve seen Oracle produce where what you see is what you get at design time.
Now, with products such as Designer and JDeveloper ADF Faces and even APEXāall those page-generation types of productsāyou have to generate the page, deploy it, and only then can you view the final page to see whether it meets the needs of your user interface.
For example, with Designer, there were literally hundreds of configuration parameters that you could set to control how forms and reports looked when they were generated ādown to how many buttons on a row or how many rows to a page, that sort of thing, all done in text mode. Then youād generate and run the page to see what the result was and then go back and modify things until you got what you wanted.
I remember hearing the product managers for Oracle ADF Faces being askedā¦well, a customer asked, āWhat happens if I put this component here and this component here? What will the page look like?ā and theyād say, āI donāt know. Render the page and letās see.ā Thatās just crazy talk.
With Redwood and its integration with Visual Builder Studio Designer, what you see on the page at design time is literally what you get. And if I make the page narrower or I even convert it to a mobile display while in the Designer itself, I immediately see what the page looks like in that new mode. Everything just moves accordingly, at design time. For example, when changing to a mobile UI, everything stacks up nicely; the components adjust to the page size and change right there in the design environment.
Again, I canāt emphasize enough the simple luxury of being able to see exactly what the user is going to see on my page and having the ability to change the resolution, orientation, and screen size, and it changes right there immediately in my design environment.
10:06
Lois: Iām intrigued by the idea of page templates that are managed by Oracle but still leave room for the developer to customize aspects of the look and feel and functionality. How does that work?
Joe: Well, the page templates themselves represent the typical pages you would most likely use in an enterprise application. Things like a welcome page, a search page, and edit and create pages, and a couple of different ways to display summary information, including foldout pages, though this is not an exhaustive list of course. Not only do they provide a logical and complete starting point for the layout of the page itself, but they also include built-in functionality.
These templates include functionality for buttons, primary and secondary actions, and areas for holding contextual information, badges, avatars, and images. And this is all built right into the page, and all of them use variables to describe the contents for the various parts, so the contents can change programmatically as the variablesā contents change, if necessary.
11:04
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11:24
Nikita: Welcome back! So, Joe, letās say Iām a developer. How do I get started working with Redwood?
Joe: One of the easiest ways to do it is to use Visual Builder Studio Designer and create a new visual application. If youāre creating a standalone, bespoke custom application, you can choose a Redwood starter template, which will include all the Redwood components and page templates automatically. Or, if youāre extending and customizing an Oracle Fusion application, Redwood is already included.
Either way, when you create a new page, you have a choice of different page templatesāwelcome page templates, edit pages, search pages, etc. āand all you have to do is choose a page that you want and begin configuring it. And actually if you make a mistake, itās easy to switch page templates.
All the components, page templates, and so on have documentation right there inside Visual Builder Studio Designer, and we do recommend that you read through the documentation first to get an understanding of what the use case for that template is and how to use it.
And some components are more granular, like a collection container which holds a collection of rows of a list or a table and provides capabilities like toolbars and other actions that are already built and defined. You decide what actions you want and then use predefined event listeners that are triggered when an event occurs in the applicationālike a button being clicked or a row being selectedāwhich kicks off a series of actions to be performed.
12:42
Lois: That sounds easy enough if you know what youāre doing. Joe, what are some of the more common pages and what are they used for?
Joe: Redwood page templates can be broken down into categories. There are overview templates like the welcome page template, which has a nice banner, colors, and illustrations that can be used for a welcoming pageālike for entering a new application or a new logical section of the application. The dashboard landing page template displays key information values and their charts and graphs, which can come from Oracle Analytics, and automatically switches the display depending on which set of data is selected.
The detail templates include a general overview, which presents read-only information related to a single record or resource. The item overview gives you a small panel to view summary information (for example, information on a customer) and in the main section, you can view details like all the orders for that customer. And you can even navigate through a set of customers, clicking arrows for next-previous navigation. And thatās all built in. Thereās no programming required.
The fold-out page template folds out horizontally to show you individual panels with more detail that can be displayed about the subject being retrieved as well as overflow and drill-down areas.
And thereās a collection detail template that will display a list with additional details about the selected item (for example, an order and its order line items).
The smart search page does exactly what it says. It has a search component that you use to filter or search the data coming back from the REST data sources and then display the results in a list or a table. You define the filter yourself and apply it using different kinds of comparators, so you can look for strings that start with certain values or contain values, or numerical values that are equal to or less than, depending on what youāre filtering for.
And then there are the transactional templates, which are meant to make changes. This includes both the simple create and edit and advanced create and edit templates.
The simple create and edit page template edits a single record or creates a single record. And the advanced page template works well if youāre working with master-detail, parent-child type relationships. Letās say you want to view the parent and create children for it or even create a parent and the children at the same time.
And thereās a Gantt chart page for project managementātype tracking and a guided process page for multiple-step processes and thereās a data management page template specifically for viewing and editing data collections like Excel spreadsheets.
14:55
Nikita: You mentioned that thereās a design system behind all this. How is this used, and how does the customer benefit from it?
Joe: Redwood comprises both a design system and a development system. The design system has a series of steps that we follow here at Oracle and can suggest that you, our customers and partners, can follow as well. This includes understanding the problem, articulating the vision for the page and the application (what it should do), identifying the proper Redwood page templates to use, adding detail and refining the design and then using a number of different mechanisms, including PowerPoint or Figma design tools to specify the design for development, and then monitor engagement in the real world. These are the steps that we follow here at Oracle.
The Redwood development process starts with learning how to use Redwood components and templates using the documentation and other content from redwood.oracle.com and Visual Builder Studio. Then itās about understanding the design created by the design team, learning more about components and templates for your application, specifically the ones youāre going to use, how they work, and how they work together. Then developing your application using Visual Builder Studio Designer, and finally improving and refining your application. Now, right now, as I mentioned, telemetry is available to us here at Oracle so we can get a sense of the feedback on the pages of how components are being used and where time is being spent, and we use that to tune the designs and components being used. That telemetry data may be available to customers in the future. Now, when you go to redwood.oracle.com, you can access the Redwood pattern book that shows you in detail all the different page templates that are available: smart search page, data grid, welcome page, dashboard landing page, and so on, and you can select these and read more about them as well as the actual design specifications that were used to build the pagesādefining what they do and what they respond to. They provide a lot of detailed information about the templates and components, how they work and how theyāre intended to be used.16:50
Lois: Thatās a lot of great resources available. But what if I donāt have access to Visual Builder Studio Designer? Can I still see how Redwood looks and behaves?
Joe: Well, if you go to redwood.oracle.com, you can log in and work with the Redwood reference application, which is a live application working with live data. It was created to show off the various page templates and components, their look and feel and functionality from the Redwood design and development systems.
This is an order management application, so you can do things like view filtered pending orders, create new orders, manage orders, and view information about customers and inventory. It uses the different page templates to show you how the application can perform.
17:29
Nikita: I assume there are common aspects to how these page templates are designed, built, and intended to be used. Is that a good way to begin understanding how to work with them? Becoming familiar with their common properties and functionality?
Joe: Absolutely! Good point! All pages have titles, and most have primary and secondary actions that can be triggered through a variety of GUI events, like clicking a button or a link or selecting something in a list or a table.
The transactional page templates include validation groups that validate whether the data is correct before it is submitted, as well as a message dialog that can pop up if there are unsaved changes and someone tries to leave the page. All the pages can use variables to display information or set properties and can easily display specific contextual information about records that have been retrieved, like adding the Order Number or Customer Name and Number to the page title or section headers.
18:18
Lois: If I were a developer, Iād be really excited to get started! So, letās say Iām a developer. Whatās the best way to begin learning about Redwood, Joe?
Joe: A great place to start learning about the Redwood design and development system is at the redwood.oracle.com page I mentioned. We have many different pages that describe the philosophy and fundamental basis for Redwood, the ideas and intent behind it, and how weāre using it here at Oracle. It also has a list of all the different page templates and components you can use and a link to the Redwood reference application where you can sign in and try it yourself.
In addition, we at Oracle University offer a course called Design and Develop Redwood Applications, and in there, we have both lecture content as well as hands-on practices where you build a lightweight version of the Redwood reference application using data from the Fusion apps application, as well as the pages that I talked about: the welcome page, detail pages, transactional pages, and the dashboard landing page.
And youāll see how those pages are designed and constructed while building them yourself.
Itās very important though to take one of the free Visual Builder Developer courses first: either Build Visual Applications Using Visual Builder Studio and/or Develop Fusion Applications Using Visual Builder Studio before you try to work through the practices in the Redwood course because it uses a lot of Visual Builder Designer technology.
Youāll get a lot more out of the Redwood practices if you understand the basics of Visual Builder Studio first. The Build Visual Applications Using Visual Builder Studio course is probably a better place to start unless you know for a fact you will be focusing on extending Oracle Fusion Applications using Visual Builder Studio. Now, a lot of the content is the same between the two courses as they share much of the same technology and architectures.
19:58
Lois: Ok, so Build Visual Applications Using Visual Builder Studio and Develop Fusion Applications Using Visual Builder Studioā¦all on mylearn.oracle.com and all free for anyone who wants to take them, right?
Joe: Yes, exactly. And the free Redwood learning path leads to an Associate certification. While our courses are a great place to start in preparing for your certification exam, they are not, of course, by themselves sufficient to pass and you will want to study and be familiar with the redwood.oracle.com content as well. The learning path is free, but you do have to pay for the certification exam.
Nikita: We hope you enjoyed that conversation. A quick reminder about the short survey weāve created to gather your insights and suggestions for the podcast. Itās really quick. Just click the link in the show notes to complete the survey. Thank you so much for helping us make the show better. Join us next week for another throwback episode. Until then, this is Nikita Abraham...
Lois: And Lois Houston, signing off!
20:58
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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Zijn er afleveringen die ontbreken?
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What do you need to start customizing the next generation of Oracle Fusion Apps? How do you create new pages for business processes? What level of expertise do you require for this? Join Lois Houston and Nikita Abraham as they get answers to all these questions and more from Senior Principal OCI Instructor Joe Greenwald. Survey: https://customersurveys.oracle.com/ords/surveys/t/oracle-university-gtm/survey?k=focus-group-2-link-share-5 Develop Fusion Applications Using Visual Builder Studio: https://mylearn.oracle.com/ou/course/develop-fusion-applications-using-visual-builder-studio/138392/ Build Visual Applications Using Oracle Visual Builder Studio: https://mylearn.oracle.com/ou/course/build-visual-applications-using-oracle-visual-builder-studio/137749/ Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X (formerly Twitter): https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started.
00:26
Lois: Welcome to the Oracle University Podcast! Iām Lois Houston, Director of Innovation Programs with Oracle University, and with me is Nikita Abraham, Team Lead of Editorial Services.
Nikita: Hi there! Youāre listening to our Best of 2024 series, where over the next few weeks, weāll be revisiting four of our most popular episodes of the year.
Lois: Todayās episode is #2 of 4, and weāre throwing it back to another episode with our friend and Senior Principal OCI Instructor Joe Greenwald. This episode is all about extending Oracle Cloud Applications that are being built using Visual Builder for the front-end.
01:04
Nikita: Right, Lois. We began by asking Joe to explain whatās happening with the redesign and re-architecture of Oracle Cloud Applications using Visual Builder Studio, or VBS.
Joe: Thatās right, Niki. Oracle is redesigning and rebuilding its entire suite of Fusion Cloud Applications, over 330 different products, utilizing over 60,000 engineers ā that is ā60,ā not ā16āāat Oracle to develop the next generation of Oracle Fusion Applications. Whatās most exciting is that the same tools the engineers are using to accomplish this are available to our partners and our customers to use to extend the functionality and capabilities of Fusion Applications to meet their custom needs and processes.
01:45
Lois: Thatās pretty awesome! We want to use this time today to ask you about extensions, the types of extensions you can create, and how to use Visual Builder Studio to create those extensions.
Nikita: Yeah, can we start with you telling us what an extension is? Iāve gotten the sense that Oracle uses the term extension as both a noun and a verb and thatās a bit confusing to me.
Joe: Yeah, good catch, Niki. Yes, Oracle does use the term extension in two ways: both as a noun and a verb. As a noun, an extension is a container for the code changes that you make to your applications. Basically, itās a Git repository that Oracle creates and manages for you. So, the extension container holds the code changes you make to your page layouts: the fields, their positioning, showing and hiding fields, that sort of thing, as well as page functionality. These code changes you make are stored in the extension and it is this extension with your code changes that is merged with the main Git branch eventually and then deployed using continuous integration/continuous deployment jobs defined in Visual Builder Studio, which manages the project and its assets. Your extension is a Git branch that is an asset of the project. Once your extension code is merged with the main branch and deployed, then the next time someone brings up the application, theyāll see the changes youāve made in the app.02:59
Lois: And as a verb?
Joe: As a verb, extension means to extend the functionality and the look and feel of the application, though I prefer the term customization or configuration to describe this aspect, as the documentation does, and to avoid confusion, though Iāll admit Iām not always consistent about the terms I use.
03:16
Lois: What types of customizations, or extensions, and Iām using the verb now, are available for Fusion Apps in Visual Builder Studio?
Joe: There are three different ways Fusion Apps can be customized effectively, configured, or extended. The first way is what we call a basic extension, where youāre rearranging hiding, or showing, or moving around fields and sections on the page that have been set up to be extendable by the Fusion Application development teams. Things like hiding fields, showing fields, hiding sections, showing sectionsā¦
03:45
Nikita: So fairly basic actionsā¦
Joe: Yeah exactly and they can be done in Visual Builder Studio Designer by people with minimal VB training, Visual Builder training. And, most recently, if you have access to it, you can do it in the new Express mode, where the page shows you just those things you can work with and just the tools you need to work with the page. This is new and makes it much easier for folks who are not highly technical to make basic changes to the page layout.
04:09
Lois: People like me! That sounds easy enough.
Joe: And the next type of extension is more of an intermediate change and requires some training with Visual Builder Studio because youāre creating rules that govern the display of layouts based on certain conditions on the page. These are highly flexible, powerful, and useful for creating customized page layouts based on a variety of factors from page size and orientation to the role of the person using it to values in the actual fields on the page itself. These rules can be combined to create complex rule-based conditions that display exactly what the user should see, given the conditions of the page and their role. I would also include making changes to action chains, which execute sequences of behaviors and navigation, and the actual structure of the application, but this is more advanced.
Lastly, is creating mashup applications, which are stand-alone Visual Builder visual applications, which use data from Fusion apps, and customer data sources, like their own database tables, and potentially third-party APIs to create brand new pages and applications with new functionality, new processes, new procedures, new displays, all of which look just like Fusion Applications and use the same data as Fusion applications.05:18
Lois: Joe, how do I get started if I want to extend a page?
Joe: The easiest way to do it is to open a page in Fusion Applications and then select Edit Page in Visual Builder Studio from the Profile menu. Youāre then prompted for a project to hold the Git repository for the extension container. And since thereās probably already one that exists, after you select the project, an extension Git container is assigned to you. Unless this is the very first time the application has been extended in which case it creates an extension for you. When creating customizations or configurations, we recommend that each application be done in its own separate project. So, for example, if youāre working on Customer Experience Sales, you might do it in Project A and if youāre working on extensions with HCM, you might do it in Project B. And if you decide to create your own pages and flows in your own app, you might do that in Project C.
06:04
Nikita: But why do you need to do this?
Joe: Thatās just to keep things nice and separate and organized. The tool, Visual Builder Studio, doesnāt really care, but it makes for cleaner development and can help with the management of the development teams.
06:14
Nikita: Ok, Joe, I have a question. How do I know if the page Iām on in Fusion Apps can be edited in Visual Builder? I know there are a lot of legacy pages still out there and they can co-exist with the new VB-based pages.
Joe: If the URL of the page youāre on has the word /Redwood in it instead of /faces, then you know this is a page that was created using Visual Builder Studio and youāll be able to extend it and make changes to it using the Edit in Visual Builder Studio option. So, if you select Edit in Visual Builder Studio, then the page you are on opens inside Visual Builder Studio Designer and you can make changes to any part of the page that has been explicitly enabled for extension by the development team.
06:53
Lois: Thatās an important part, right? The application is not extendable by default.
Joe: Thatās right, Lois. It is all locked down and you canāt make any changes to it by default. The development team must specifically enable certain parts of the page: sections, fields, layouts, variables, types, action chains, etc. as extendable for you to be able to make changes to it.
This ensures the changes the development team makes to the application in the future wonāt break your extensions. And conversely, the development team can choose to not extend portions that they do not want you to touch or mess with. Then if they do change that bit of the app in the future, it wonāt break the application and you wonāt get a big surprise.
So, using the Edit page in Visual Builder Studio, you can make both basic changes, like moving, showing, and hiding fields and sections, as well as the more intermediate types of configurations, like using dynamic components to create rule-based layouts that change dynamically based on several conditions such as page size, roles of the user, and field values on the page itself.
07:51
Nikita: What happens if two developers make changes and essentially overwrite each otherās customizations ā say one hides a field and another later exposes it?
Joe: Well, whoever commits their changes and deploys last wins. The other developerās changes get overwritten. So, this is something the team would want to consider carefully. It is possible to roll back to an earlier version if one must. And this can be done in Visual Builder Studio ā the part that manages project assets like Git repositories. And there are Oracle blog posts about how to do that if youāre interested in learning more.
08:20
Lois: Joe, earlier you mentioned creating new pages and flows, but so far youāve only talked about modifying existing extendable pages. How do I create new pages and flows?
Joe: In a Visual Builder extension, a set of pages and flows is called an App UI. When I use the terms pages and flows, what Iām talking about is a set of pages that are logically relatedāwhatever logical means to the designer and developerāin a group called a flow that you can navigate between. But you can also navigate between flows and even between applications. So, without getting too technical, each application has a default flow, which has a default page where that flow starts when the app first comes up. So, you can think of an App UI as a collection of flows and their pages, and a URL that accesses the default flow and its default page. Thatās the page you would see first when accessing that URL. Of course, this can be configured and changed by the developer, as needed.
Now, when Oracle creates the original application (for example, digital sales, helpdesk, or something like that), we create an App UI, which contains the pages and flows for that application and is the āentry pointā into the app, accessing that App UIās default flow and its default page and then things flow on from there.
Partners and customers can create their own application extensions that are dependent on an Oracle application and even create their own App UI ā their own sets of pages and flows to accommodate their own processing and workflow needs. This gives them the ability to add their own processes and rules, and still leverage and navigate to the core application that Oracle built.For example, say Oracle delivered digital sales as an Oracle Cloud Application built using Visual Builder to a customer and the customer needs to add a few pages to do some validation or other type of business processing before entering the digital sales application. What the customer does, in this case, is create a new extension of the Oracle Digital Sales app and an App UI of their own, which would be the set of pages and flows that contain the processing they want to start with before then navigating into the digital sales app to use Oracleās application.
10:22
Nikita: Wait, did I hear that correctly? Weāre creating an extension of an extension or creating an extension on an existing extension?
Joe: I know, right? I realize this can sound confusing the first time you hear it or the second time or even the third time. It took me a while to get my head around what theyāre talking about. Letās start with a Fusion application. In a Fusion application, everything is an extension of something. This is just how the code base and the architecture are organized and how they manage the Git repositories and the code base itself.
So, Oracle created a base application called the Unified App. The Unified Application contains the basic page structure and common functionality needed for all applications. For example, it contains the header at the top that has the profile and the footer at the bottom of the page that has that little Ask Oracle icon.
Within that page, between the header and the footer, are the pages that are created by the developers, whether they be Oracle engineers or partners or customers. They display the contents of the page with the data and the layouts and all of that.In a sense, you can think of the Unified App as an index page, the starting page of the web application. Though thatās not completely true technically, itās good enough for illustrative purposes. So, Oracle starts with the Unified App and then a development team extends that Unified App to build their product. This is how digital sales did it. This is how customer experience did it. This is how helpdesk did it. They start with the Unified App and they extend that and create an App UI that contains the flows and pages for their specific application, and then add functionality for all the pages and flows, as needed for the design.
Partners and customers can then create a new extension that extends the Oracle Application and add their own App UI and their own URL if they want their pages accessed first, before navigating to the Oracle application. For example, if the digital sales application has functionality youād like to leverage, like it has data services or fragments or page layouts that you want to reuse or other things, you extend the digital sales application, and this extension holds your code changes. You could then create a new App UI, and once deployed, users can use that URL for the new App UI to access your new pages. And your page can then navigate to the Oracle app when it needs to. Though I will say to date, weāre really not seeing much demand for this particular use case, but it is possible.
12:33
Lois: Is that the only option available to customers and partnersāto extend an existing Oracle application?
Joe: No, Lois. Weāre seeing customers and partners create brand new Fusion applications of their own, based on the Unified App Oracle created. In a sense, doing the same thing that our development teams here are doing.Remember, I said an Oracle development team starts with the Unified App, which has common functionality and look and feel for all applications, and then extends that to add business rules processing, flows, App UI, whatever they need for their specific Oracle application.
Weāre seeing our partners and customers wanting to build their own applications. Maybe a customer or partner wants to create a Time & Expense application and leverage the Fusion application data and the APIs available, but define their own flows, their own pages, their own processing. This is very easy to do. Theyād start by extending the Unified App just like the Oracle development teams do, and then build their own App UI and within that, their own flows, pages, and custom processing.
The nice thing about it is that the application looks and works and feels just like a Fusion application and it appears alongside other Fusion applications, because it is a Fusion application.13:43
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14:24
Nikita: Welcome back! So Joe, it sounds like there are two different paths or life cycles to create extensions for future applications in Visual Builder Studio. Is that correct?
Joe: Yes, exactly. So one path to extending the functionality of Fusion apps is to edit the page in Visual Builder Studio, which opens the page in Visual Builder Designer, and you then make changes to the existing pages, depending on what the development team has made extendable.
14:49
Nikita: But you canāt create new pages and flows in this scenario, right?
Joe: This is strictly about modifying an existing page. The other path is creating a new application extension, which is a new application from scratch or extending an existing Oracle application or even an existing partner or customer application. Again, weāre not seeing this typically being done too much. Most partners and customers create new applications or make customizations to existing pages. But the architecture does support it. So, your partner might create a new application based on the production app released by Oracle, and you could extend their application. Or a development team at your site could extend Oracleās application and you could then extend that teamās application. This is mechanically possible, although I question the use case behind that. Usually, we see our apps being extended ā becoming a dependency when thereās code that can be leveraged or reused for a new app and its new App UI.
15:40
Lois: Joe, what did you mean when you say one extension is a dependency of another? Can you talk a bit about dependencies, what that means, how it looks to the developer?
Joe: When you extend an application, it becomes a dependency to your application, and you get access to all the resources within that dependency that are marked as extendable by the developer who created that extension. Most useful are things like service connections to REST APIs from Fusion apps data sources, reusable code fragments, and layouts that you can leverage in those cases where you want to create a new App UI. When an extension is listed as a dependency, youāll see this graphically in Visual Builder Studio Designer. When you see an extension listed as a dependency, it means you can reference any of that extensionās resources that have been marked extendable by the developer. Recall all resources are closed off or hidden by default, but development teams can mark resources as open to being extended and reused, and then you can see and use those resources. So, you can easily add and remove extensions as dependencies in Visual Builder Designer as needed. Now, this can be a nice way to modularize and reuse your resources and assets. To summarize: I can modify an existing page ā this is most common, extend an existing application and create a new App UI, which is not common, or I can extend the unified app to create a new app and a new App UI and add other extensions as dependences, as needed, to leverage their services, fragments, and layouts when building my own pages ā this is pretty common as well.
17:04
Nikita: Thereās one thing Iād like to come back to, Joe. You mentioned something called a mashup application earlier. Can you tell us a little more about that?
Joe: To recap: I mentioned a couple of different ways that you can extend Fusion applications. One is changing layouts or creating rule-based layouts. You can also extend existing apps and create your own App UI on top of them or create your own Fusion app from scratch. But these are Fusion apps and they have restrictions.
These can only run within the Fusion applications ecosystem, which means they can only be accessed by people who are registered in the Fusion application ecosystem, and there are some other restrictions (for example, in terms of the APIs you can access). And you also have no access to customer data tables.
Mashup applications use the stand-alone Visual Builder Cloud Service, which enables you to create custom visual applications. These are visual applications that run outside the Fusion apps ecosystem. Users only need to be identified to the Identity Cloud Service, IDCS, and then they can get access to these mashup apps, depending on the roles and privileges given to them, of course. These mashup applications can access Fusion apps API data, as well as customer database tables, Excel spreadsheet data, CSV files, and third-party APIs. And all this data can appear on the same page, in the same app, using the same Redwood components, so they look and work just like Fusion applications.
18:22
Lois: I know in the past thereās been some friction to making changes in Fusion applications. Partner and customer developers use different tools than the ones Oracle engineers use and there have been some deployment issues. To wrap up things, can you tell us why customers should use Visual Builder Studio to customize Fusion apps?
Joe: Glad to, Lois. The big benefit to customers is that they are using the exact same tools, Visual Builder Designer for page design work and Visual Builder Studio for project and code management, to build the customizations and extensions that Oracle is using to create the applications and extensions that are delivered to them.
I canāt emphasize enough how big a deal this is and how wonderful it is for the customer. Weāre constantly making the Visual Builder Designer interface easier and easier to work with.
Weāre currently releasing a new version of Visual Builder Designerāthe Express mode version. This version of Designer is lightweight and has only the necessary features required to allow you to make changes to pages and layouts, and create and manage dynamic rule-based layouts. If you need more (for example, you need to create service connections, fragments, and do a lot more of that type of advanced work), then use the advanced version of the Designer. Both are available to you, assuming that your user has the appropriate permission and the Fusion app you are using has implemented Express Designer.19:37
Lois: OK Joe, what courses does Oracle University offer for me if I wanted to learn more about developing extensions for Fusion apps and creating mashup apps using Visual Builder Studio?
Joe: Oracle University has several courses. We have the Develop Visual Applications Using Visual Builder Studio, which focuses on creating the stand-alone custom bespoke mashup visual applications.
We also have our Design and Develop Redwood Applications course, which goes into detail about working with the Redwood page templates and components. All these courses are free and available today. And all you need to do is log in to mylearn.oracle.com to get started.
20:10
Nikita: We hope you enjoyed that conversation. Just a quick reminder before we close about the short survey weāve put together to get your thoughts on the podcast. Itāll take just a few minutes and will help us make the podcast even better. Just click the link in the show notes to participate. Join us next week for another throwback episode. Until then, this is Nikita Abraham...
Lois: And Lois Houston, signing off!
20:33
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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The next generation of front-end user interfaces for Oracle Fusion Applications is being built using Visual Builder Studio and Oracle JavaScript Extension Toolkit. However, many of the terms associated with these tools can be confusing. In this episode, Lois Houston and Nikita Abraham are joined by Senior Principal OCI Instructor Joe Greenwald. Together, they take you through the different terminologies, how they relate to each other, and how they can be used to deliver the new Oracle Fusion Applications as well as stand-alone, bespoke visual web applications. Survey: https://customersurveys.oracle.com/ords/surveys/t/oracle-university-gtm/survey?k=focus-group-2-link-share-5 Develop Fusion Applications Using Visual Builder Studio: https://mylearn.oracle.com/ou/course/develop-fusion-applications-using-visual-builder-studio/138392/ Build Visual Applications Using Oracle Visual Builder Studio: https://mylearn.oracle.com/ou/course/build-visual-applications-using-oracle-visual-builder-studio/137749/ Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X (formerly Twitter): https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started.00:26
Nikita: Hello and welcome to the Oracle University Podcast! Iām Nikita Abraham, Team Lead of Editorial Services with Oracle University, and with me is Lois Houston, Director of Innovation Programs.
Lois: Hi there! If youāve been following along with us, youāll know that weāve had some really interesting seasons this year. We covered Autonomous Database, Artificial Intelligence, Visual Builder Studio and Redwood, OCI Container Engine for Kubernetes, and Oracle Database 23ai New Features.
Nikita: And weāve had some pretty awesome special guests. Do go back and check out those episodes if any of those topics interest you.
01:04
Lois: As we close out the year, we thought this would be a good time to revisit some of our best episodes. Over the next few weeks, youāll be able to listen to four of our most popular episodes of the year.
Nikita: Right, this is the best of the bestāaccording to youāour listeners.
Lois: Todayās episode is #1 of 4 and is a throwback to a discussion with Senior Principal OCI Instructor Joe Greenwald on Visual Builder Studio.
Nikita: We asked Joe about Visual Builder Studio and Oracle JavaScript Extension Toolkit, also known as JET. Together, they form the basis of the technology for the next generation of front-end user interfaces for Oracle Fusion Applications, as well as many other Oracle applications, including most Oracle Cloud Infrastructure (OCI) interfaces.
01:48
Lois: We looked at the different terminologies and technologies, how they relate to each other, and how they deliver the new Oracle Fusion Applications and stand-alone, bespoke visual web applications. So, letās dive right in.
Nikita: Joe, Iām somewhat thrown by the terminology around Visual Builder, Visual Studio, and JET. Can you help streamline that for us?
Lois: Yeah, things that are named the same sometimes refer to different things, and sometimes things with a different name refer to the same thing.
02:18
Joe: Yeah, I know where youāre coming from. So, letās start with Visual Builder Studio. Itās abbreviated as VBS and can go by a number of different names. Some of the most well-known ones are Visual Builder Studio, VBS, Visual Builder, Visual Builder Stand-Alone, and Visual Builder Cloud Service. Clearly, this can be very confusing. For the purposes of these episodes as well as the training courses I create, I use certain definitions.02:42
Lois: Can you take us through those?
Joe: Absolutely, Lois. Visual Builder Studio refers to a product that comes free with an OCI account and allows you to manage your project-related assets. This includes the project itself, which is a container for all of its assets. You can assign teams to your projects, as well as secure the project and declare roles for the different team members. You manage GIT repositories with full graphical and command-line GIT support, define package, build, and deploy jobs, and create and run continuous integration/continuous deployment graphical and code-managed pipelines for your applications. These can be visual applications, created using the Visual Builder Integrated Development Environment, the IDE, or non-visual apps, such as Java microservices, docker builds, NPM apps, and things like that. And you can define environments, which determine where your build jobs can be deployed.
You can also define issues, which allow you to identify, track, and manage things like bugs, defects, and enhancements. And these can be tracked in code review merge requests and build jobs, and be mapped to agile sprints and scrum boards. Thereās also support for wikis for team collaboration, code snippets, and the management of the repository and the project itself.
So, VBS supports code reviews before code is merged into GIT branches for package, build, and deploy jobs using merge requests.
04:00
Nikita: OK, what exactly do you mean by that?
Joe: Great. So, for example, you could have developers working in one GIT branch and when theyāre done, they would push their private code changes into that remote branch. Then, theyād submit a merge request and their changes would be reviewed.
Once the changes are approved, their code branch is merged into the main branch and then automatically runs a CI/CD package (continuous integration/continuous deployment) package, build, and deploy job on the code. Also, the CI/CD package, build, and deploy jobs can run against any branches, not just the main branch. So Visual Builder Studio is intended for managing the project and all of its assets.
04:37
Lois: So Joe, what are the different tools used in developing web applications?
Joe: Well, Visual Builder, Visual Builder Studio Designer, Visual Builder Designer, Visual Builder Design-Time, Visual Builder Cloud Service, Visual Builder Stand-Alone all kind of get lumped together. You can kinda see why. What Iām referring to here are the tools that we use to build a visual web application composed of HTML5, CSS3, JavaScript, and JSON (JavaScript Object Notation) for metadata. I call this Visual Builder Designer. This is an Integrated Development Environment, itās the āIDEā which runs in your browser. You use a combination of drag and drop, setting properties, and writing and modifying custom and generated code to develop your web applications. You work within a workspace, which is your own private copy of a remote Git branch.
When youāre ready to start development work, you open an existing workspace or create a new one based on a clone of the remote branch you want to work on. Typically, a new branch would be created for the development work or you would join an existing branch.
05:38
Nikita: Whatās a workspace, Joe? Is it like my personal laptop and drive?
Joe: A workspace is your own private code area that stores any changes you make on the Oracle servers, so your code changes are never lostāeven when working in a browser-based, network-based tool. A good analogy is, say I was working at home on my own machine. And I would make a copy of a remote GIT branch and then copy that code down to my local machine, make my code changes, do my testing, etc. and then commit my workācreate a logical save point periodicallyāand then when Iām ready, Iād push that code up into the remote branch so it can be reviewed and merged with the main branch. My local machine is my workspace.
However, since this code is hosted up by Oracle on our servers, and the code and the IDE are all running in your browser, the workspace is a simulation of a local work area on your own computer.
So, the workspace is a hosted allocation of resources for you thatās private. Other people canāt see whatās going on in your workspace. Your workspace has a clone of the remote branch that youāre working with and the changes you make are isolated to your cloned code in your workspace.
06:41
Lois: Okā¦ the code is actually hosted on the server, so each time you make a change in the browser, the change is written back to the server? Is it possible that you might lose your edits if thereās a networking interruption?
Joe: I want to emphasize that while I started out not personally being a fan of web-based integrated development environments, I have been using these tools for over three years and in all that time, while I have lost a connection at timesānetworks are still subject to interruptionsāIāve never lost any changes that Iāve made. Ever.
07:11
Nikita: Is there a way to save where you are in your work so that you could go back to it later if you need to?
Joe: Yes, Niki, youāre asking about commits and savepoints, like in a Git repository or a Git branch. When you reach a logical stopping or development point in your work, you would create a commit or a savepoint. And when youāre ready, you would push that committed code in your workspace up to the remote branch where it can be reviewed and then eventually merged, usually with the main Git branch, and then continuous integration/continuous package and deployment build jobs are run.
Now, Iām only giving you a high-level overview, but we cover all this and much more in detail with hands-on practices in our Visual Builder developer courses. Right now, Iām just trying to give you a sense of how these different tools are used.
07:52
Lois: Yeah, that makes sense, Joe. Itās a lot to cover in a short amount of time. Now, weāve discussed the Visual Builder Designer IDE and workspace. But can you tell us more about Visual Builder Cloud Service and stand-alone environments? What are they used for? What features do they provide? Are they the same or different things?
Joe: Visual Builder Cloud Service or Visual Builder Stand-Alone, as itās sometimes called, is a service that Oracle hosts on its servers. It provides hosting for the deployed web application source code as well as database tables for business objects that we build and maintain to store your customer data. This data can come from XLS or CSV files, or even your own Oracle database customer table data.
A custom REST proxy makes calls to external third-party REST services on your behalf and supports several popular authentication mechanisms. There is also integration with the Identity Cloud Service (IDCS) to manage users and their access to your web apps.
Visual Builder Cloud Service is a for-fee product. You pay licensing fees for how much you use because itās a hosted service. Visual Builder Studio, the project asset management aspect I discussed earlier, is free with a standard OCI license.
Now, keep in mind these are separate from something like Visual Builder Design Time and the service thatās running in Fusion application environments.
What Iām talking about now is creating stand-alone, bespoke, custom visual applications. These are applications that are built using industry-standard HTML5, CSS3, JavaScript, and JSON for metadata and are hosted on the Oracle servers.
09:30
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Visit mylearn.oracle.com to get started.
10:12
Nikita: Welcome back! Joe, you said Visual Builder Cloud Service or Stand-Alone is a for-fee service. Is there a way I can learn about using Visual Builder Designer to build bespoke visual applications without a fee?
Joe: Yes. Actually, weāve added an option where you can run the Visual Builder Designer and learn how to create web apps without using the app hosting or the business object database that stores your customer data or the REST proxy for authentication or the Identity Cloud Service. So you donāt get those features, but you can still learn the fundamentals of developing with Visual Builder Designer. You can call third-party APIs, you can download the source, and run it locally, for example, in a Tomcat server. This is a great and free way to learn how to develop with the Visual Builder Designer.
10:55
Lois: Joe, I want to know more about the kinds of apps you can build in VB Designer and the capabilities that VB Cloud Service provides.
Joe: Visual Builder Designer allows you to build custom, bespoke web applications made of interactive webpages; flows of pages for navigation; events that respond when things happen in the app, for example, GUI events like a button is clicked or values are entered into a text field; variables to store the state of the application and the ability to make REST calls, all from your browser. These applications have full access to the Oracle Fusion Applications APIs, given that you have the right security permissions and credentials of course. They can access your customer business data as business objects in our internally hosted database tables or your own customer database tables. They can access third-party APIs, and all these different data sources can appear in the same visual application, on the same page, at the same time. They use the Identity Cloud Service to identify which users can log in and authenticate against the application. And they all use the new Redwood graphical user interface components and page templates, so they have the same look and feel of all Oracle applications.
12:02
Nikita: But what if youāre building or extending Oracle Fusion Applications? Donāt things change a little bit?
Joe: Good point, Niki. Yes. While you still work within Visual Builder Studio, that doesnāt change, VBS maintains your project and all your project-related assets, that is still the same. However, in this case, there is no separate hosted Visual Builder Cloud Service or Stand-Alone instance. In this case, Visual Builder is hosted inside of Fusion apps itself as part of the installation. I wonāt go into the details of how the architecture works, but the Visual Builder instance that youāre running your code against is part of Fusion applications and is included in the architecture as well as the billing. All your code changes are maintained and stored within a single container called an extension. And this extension is a Git repository that is created for you, or you can create it yourself, depending on how you choose to work within Visual Builder Studio.
You create an extension to hold the source code changes that provide a customization or configuration. This means making a change to an existing page or a set of pages or even adding new pages and flows to your Oracle Fusion Applications. You use Visual Builder Studio and Visual Builder Designer in a similar way as to how you would use them for bespoke stand-alone visual applications.13:12
Lois: Iām trying to envision how this workflow is used. How is it different from bespoke VB app development? Or is it different at all?
Joe: So, recall that the Visual Builder Designer is effectively the Integrated Development Environment, the IDE, where you make your code changes by working with both the raw HTML5, CSS3, and JavaScript code, if need be, or the Page Designer for drag and drop, and setting properties and then Live mode to test your work. You use a version of VB Designer to view and modify your customizations, and the code is stored in a Git repository called an extension. So, in that sense, the work of developing pages and flows and such is the same.You still start by creating or, more typically, joining a project and then either create a new extension from scratch or base it on an existing application, or go directly to the page that you want to edit and, on that page, select from your profile menu to edit in Visual Builder Studio. Now, this is a different lifecycle path from bespoke visual applications. With them, youāre not extending an app or modifying individual pages in the same way.
You get a choice of which project you want to add your extension to when youāre working with Fusion apps and potentially which repository to store your customizations, unless one already exists and then itās assigned automatically to hold your code changes.
So you make your changes and edits to the portions of the application that have been opened for extensibility by the development team. This is another difference. Once you make your code changes, the workflow is pretty much the same as for a bespoke visual application: do your development work, commit your changes, push your changes to the remote branch. And then typically, your code is reviewed and if the code passes and is approved, itās merged with the main branch. Then, the package and deploy jobs run to deploy the main code to the production environment or whatever environment youāre targeting. And once the package and deploy jobs complete, the code base is updated and users who log in see the changes that youāve made.
15:03
Nikita: You mentioned creating apps that combine data from Fusion cloud, applications, customer data, and third-party APIs into one page. Why is it necessary? Why canāt you just do all that in one Fusion Applications extension?
Joe: When you create extensions, you are working within the Oracle Fusion Applications ecosystem, thatās what they actually call it, which includes a defined a set of users who have been predefined and are, therefore, known to Fusion Applications. So, if youāre a user and youāre not part of that Fusion Apps ecosystem, you canāt access the pages. Period. Thatās how Fusion Apps works to maintain its security and integrity. Secondly, youāre working pretty much solely with the Fusion Applications APIs data sources coming directly from Fusion Applications, which are also available to you when youāre creating bespoke visual apps. When youāre working with Fusion Applications in Visual Builder, you donāt have access to these business objects that give you access to your own customer database data through Visual Builder-generated REST APIs. Business objects are available only to bespoke visual applications in the hosted VB Cloud Service instance.So, your data sources are restricted to the Oracle Fusion Applications APIs and some third-party APIs that work within a narrow set of authentication mechanisms currently, although there are plans to expand this in the future. A mashup app that allows you now to access all these data sources while creating apps that leverage the Redwood Component System, so they look and work like Fusion Apps. Theyāre a highly popular option for our partners and customers.
16:28
Lois: So, to review, we have two different approaches. You can create a visual application using the for-fee, hosted Visual Builder Cloud Service/Stand-Alone or the one that comes with Oracle Integration Cloud, or you can use the extension architecture for Fusion applications, where you use the designer and create your extensions, and the code is delivered and deployed to Fusion applications code.
You havenāt talked about JET yet though, Joe. What is that?
Joe: So, JET is an abbreviation. It stands for Oracle JavaScript Extension Toolkit and JET is the underlying technology that makes Visual Builder, visual applications, and Visual Builder Extensions for Fusion Applications possible.
Oracle JavaScript Extension Toolkit provides a module-based, open-source toolkit that leverages modern JavaScript, TypeScript, CSS3, and HTML5 to deliver web applications. Itās targeted at JavaScript developers working on client-side applications. It is not for backend development.
Itās a collection of popular, powerful JavaScript libraries and a set of Oracle-contributed JavaScript libraries that make it very simple, easy, and efficient to build front-end applications that can consume and interact with Oracle products and services, especially Oracle Cloud services, but of course it can work with any type of third-party API.17:44
Nikita: How are JET applications architected, Joe, and how does that relate to Visual Builder pages and flows?
Joe: The architecture of JET applications is whatās called a single page architecture. Weāve all seen these. These are where you have a single webpageāthink of your index page that provides the header and footer for your webpageāand then the middle portion or the middle content of the page, represented by modules, allow you to navigate from one page or module to another. It also provides the data mapping so that the data elements in the variables and the state of the application, as well as the graphical user interface elements that provide the fields and functionality for the interface for the application, these are all maintained on the client side.
If youāre working in pure JET, then you work with these modules at the raw JavaScript code level. And there are a lot of JavaScript developers who want to work like this and create their custom applications from the code up, so to speak. However, it also provides the basis for Visual Builder visual applications and Fusion Apps visual extensions in Visual Builder.
18:41
Lois: How does JET support VB Apps? You didnāt talk much about having to write a bunch of JavaScript and HTML5, so I got the impression that this is all done for you by VB Designer?
Joe: Visual Builder applications are composed of HTML5, CSS3, and JavaScript code that is usually generated by the developer when she drags and drops components on to the page designer canvas or sets properties or creates action chains to respond to events.But thereās also a lot of JavaScript object notation (JSON) metadata created at the time that describes the pages, the flows, the navigation, the REST services, the variables, their data types, and other assets needed for the app to function. This JSON metadata is translated at runtime using a large JavaScript extension toolkit library called the Visual Builder Runtime that runs in the browser and real time translates the metadata and other assets in the Visual Builder source code into JET code and assets, which are actually executed at runtime. And itās very quick, very fast, very efficient, and provides a layer of abstraction between the raw JET code and the Visual Builder architecture of pages, flows, action chains for executing code and events to handle things that occur in the user interface, including saving the state in variables that are mapped to GUI components. For example, if you have an Input text component, you need to have a variable to store the value that was entered into that Input text component between page refreshes. The data can move from the Input text component to the variable, and from the variable to that Input text component if itās changed programmatically, for example. So, JET manages binding these data values to variables and the UI components on the page. So, a change to a variable value or a change to the contents of the component causes the others to change automatically. Now, this is only a small part of what JET and the frameworks and libraries it uses do for the applications.
JET also provides more complex GUI components like lists and tables, and selection lists, and check boxes, and all the sorts of things you would expect in a modern GUI application.
20:37
Nikita: You mentioned a layer of abstraction between Visual Builder Studio Designer and JET. Whatās the benefit of working in Visual Builder Designer versus JET itself?
Joe: The benefit of Visual Builder is that you work at a higher level of abstraction than having to get down into the more detailed levels of deep JavaScript code, working with modules, data mappings, HTML code, single page architecture navigation, and the related functionalities.
You can work at a higher level, a graphical level, where you can drag and drop things onto a design canvas and set properties. The VB architecture insulates you from the more technical bits of JET. Now, this frees the developer to concentrate more on application and page design, implementing logic and business rules, and creating a pleasing workflow and look and feel for the user. This keeps them from having to get caught up in the details of getting this working at the code level.
Now if needed, you can write custom JavaScript, HTML5, and CSS3 code, though much less than in a JET app, and all that is part of the VB application source, which becomes part of the code used by JET to execute the application itself. And yet it all works seamlessly together.
21:38
Lois: Joe, I know we have courses in JavaScript, HTML, and CSS. But does a developer getting ready to work in Visual Builder Designer have to go take those courses first or can they start working in VB Designer right away?
Joe: Yeah, that question does often comes up: Do I need to learn JET to work with Visual Builder? No, you donāt. Thatās all taken care for you in the products themselves. I donāt really think it helps that much to learn JET if you are going to be a VB developer. In some ways, it could even be a bit distracting since some of things you learn to do in JET, you would have to unlearn or not do so much because of what VB does it for you. The things you would have to do manually in code in JET are done for you. This is why we call VB a low code development tool.
I mean, you certainly can if you want to, but I would spend more time learning about the different GUI components, page templates, the Visual Builder architecture ā events, action chains, and the data provider variables and types. Now, I know JET myself. I started with that before learning Visual Builder, but I use very little of my JET knowledge as a VB developer.
Visual Builder Designer provides a nice, abstracted, clean layer of modern visual development on top of JET, while leveraging the power and flexibility of JET and keeping the lower-level details out of my way.
22:49
Nikita: Joe, where can I go to get started with Visual Builder?
Joe: Well, for more information, I recommend you take a look at our Develop Fusion Applications course if youāre working with Fusion Applications and Visual Builder Studio. The other course is Develop Visual Applications with Visual Builder Studio and thatās if youāre creating stand-alone bespoke applications. Both these courses are free. We also have a comprehensive course that covers JavaScript, HTML5, and CSS3, and while itās not required that you take that to be successful, it can be helpful down the road. I would also say that some basic knowledge of HTML5, CSS3, and JavaScript will certainly support you and serve you well when working with Visual Builder. You learn more as you go along and you find that you need to create more sophisticated applications.
I would also mention that a lot of the look and feel of the applications in Visual Builder visual applications and Fusion apps extensions and customizations come through JET components, JET styles, and JET variables, and CSS variables, so thatās something that you would want to pursue at some point. Thereās a JET cookbook out there. You can search for Oracle JET and look for the JET cookbook and thatās a good introduction to all of that.
23:50
Nikita: We hope you enjoyed that conversation. To learn about some of the courses Joe mentioned, visit mylearn.oracle.com to get started.
Lois: Before we wrap up, weāve got a favor to ask. Weāve created a short survey to capture your thoughts on the podcast. Itāll only take a few minutes of your time. Just click the link in the show notes and share your feedback. We want to make sure weāre delivering the best experience possible so don't hesitate to let us know what's on your mind! Thanks for your support. Join us next week for another throwback episode. Until then, this is Lois Houstonā¦
Nikita: And Nikita Abraham, signing off!
24:30
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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In this special episode of the Oracle University Podcast, Lois Houston and Nikita Abraham, along with Principal HCM Instructor Jeff Schuster, delve into the intersection of HCM and AI, exploring the practical applications and implications of this technology in human resources.
Jeff shares his insights on bias and fairness, the importance of human involvement, and the need for explainability and transparency in AI systems. The discussion also covers the various AI features embedded in HCM and their impact on talent acquisition, performance management, and succession planning.
Oracle AI in Fusion Cloud Human Capital Management: https://mylearn.oracle.com/ou/learning-path/oracle-ai-in-fusion-cloud-human-capital-management-hcm/136722
Oracle Fusion Cloud HCM: Dynamic Skills: https://mylearn.oracle.com/ou/course/oracle-fusion-cloud-hcm-dynamic-skills/116654/
Oracle University Learning Community: https://education.oracle.com/ou-community
LinkedIn: https://www.linkedin.com/showcase/oracle-university/
Twitter: https://twitter.com/Oracle_Edu
Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode.
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00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26
Lois: Hello and welcome to the Oracle University Podcast! Iām Lois Houston, Director of Innovation Programs here at Oracle University, and with me, is Nikita Abraham, Team Lead of Editorial Services.
Nikita: Hi everyone! Last weekās conversation was all about Oracle Database 23ai backup and recovery, where we dove into instance recovery and effective recovery strategies. Todayās episode is a really special one, isnāt it, Lois?
00:53
Lois: It is, indeed, Niki. Of course, all of our AI episodes are special. But today, we have our friend and colleague Jeff Schuster with us. I think our listeners are really going to enjoy what Jeff has to share with us.
Nikita: Yeah definitely! Jeff is a Principal HCM Instructor at Oracle University. He recently put together this really fantastic course on MyLearn, all about the intersection of HCM and AI, and thatās what we want to pick his brain about today. Hi Jeff! Weāre so excited to have you here.
01:22
Jeff: Hey Niki! Hi Lois! I feel special already. Thanks you guys so much for having me.
Nikita: Youāve had a couple of busy months, havenāt you?
01:29
Jeff: I have! Itās been a busy couple of months with live classes. I try and do one on AI in HCM at least once a month or so so that we can keep up with the latest/greatest stuff in that area. And I also got to spend a few days at Cloud World teaching a few live classes (about artificial intelligence in HCM, as a matter of fact) and meeting our customers and partners. So yeah, absolutely great week. A good time was had by me.
01:55
Lois: Iām sure. Cloud World is such a great experience. And just to clarify, do you think our customers and partners also had a good time, Jeff? It wasnāt just you, right?
Jeff: Haha! I donāt think it was just me, Lois. But, you know, HCM is always a big deal, and now with all the embedded AI functionality, it really wasnāt hard to find people who wanted to spend a little extra time talking about AI in the context of our HCM apps. So, there are more than 30 separate AI-powered features in HCM. AI features for candidates to find the right jobs; for hiring managers to find the right candidates; skills, talent, performance management, succession planningā all of it is there and it really covers everything across the Attract/Grow/Keep buckets of the things that HR professionals do for a living. So, anyway, yeah, lots to talk about with a lot of people!
Thereās the functional part that people want to know aboutāwhat are these features and how do they work? But obviously, AI carries with it all this cultural significance these days. Thereās so much uncertainty that comes from this pace of development in that area. So in fact, my Cloud World talk always starts with this really silly intro that we put in place just to knock down that anxiety and get to the more practical, functional stuff.
03:11
Nikita: Ok, weāre going to need to discuss the functional stuff, but I feel like weāre getting a raw deal if we donāt also get that silly intro.
Lois: She makes a really good point.
Jeff: Hahaha! Alright, fair enough. Ok, but you guys are gonna have to imagine Iāve got a microphone and a big room and a lot of echo.
AI is everywhere. In your home. In your office. In your homieās home office.
03:39
Lois: I feel like I just watched the intro of a sci-fi movie.
Jeff: Yeah. Iām not sure itās one Iād watch, but I think more importantly itās a good way to get into discussing some of the overarching things we need to know about AI and Oracleās approach before we dive into the specific features, so you know, those features will make more sense when we get there?
03:59
Nikita: What are these āoverarchingā things?
Jeff: Well, the things we work on anytime weāre touching AI at Oracle. So, you know, it starts with things like Bias and Fairness. We usually end up in a pretty great conversation about things like how we avoid bias on the front end by making sure we donāt ingest things like bias-generating content, which is to say data that doesnāt necessarily represent bias by itself, but could be misused. And that pretty naturally leads us into a talk about guardrails.
Nikita: Guardrails?
Jeff: Yeah, you can think of those as checkpoints. So, weāve got rules about ingestion and bias. And if we check the output coming out of the LLM to ensure it complied with the bias and fairness rules, thatās a guardrail. So, we do that. And we do it again on the apps side. And so thatās to say, even though itās already been checked on the AI side, before we bring the output into the HCM app, itās checked again. So another guardrail.
04:58
Lois: How effective is that? The guardrails, and not taking in data thatās flagged as bias-generating?
Jeff: Well, Iāll say this: Itās both surprisingly good, and also nowhere near good enough.
Lois: Ok, thatās as clear as mud. You want to elaborate on that?
Jeff: Haha! I think all it means is that approach does a great job, but our second point in the whole āstandardsā discussion is about the significance of having a human in the loop. Sometimes more than one, but the point here is that, particularly in HCM, where weāre handling some really important and sensitive data, and weāre introducing really powerful technology, the H in HCM gets even more important. So, throughout the HCM AI course, we talk about opportunities to have a human in the loop. And itās not just for reviewing things. Itās about having the AI make suggestions, and not decisions, for example. And thatās something we always have a human in the loop for all the time. In fact, when I started teaching AI for HCM, I always said that I like to think of it is as a great big brain, without any hands.
06:00
Nikita: So, weāre not talking about replacing humans in HCM with AI.
Jeff: No, but weāre definitely talking about changing what the humans do and why itās more important than ever what the humans do.
So, think of it this way, we can have our embedded AI generate this amazing content, or create really useful predictions, whatever it is that we need. We can use whatever tools we want to get there, but we can still expect people to ask us, āWhere did that come from?ā or āDoes this account for [whatever]?ā. So we still have to be able to answer that. So thatās another thing we talk about as kind of an overarching important concept: Explainability and Transparency.
06:41
Nikita: Iām assuming thatās the part about showing our work, right? Explaining what's being considered, how it's being processed, and what it is that you're getting back.
Jeff: Thatās exactly it. So we like to have that discussion up front, even before we get to things like Gen and Non-Gen AI, because itās great context to have in mind when you start thinking about the technology. Whenever weāre looking at the tech or the features, weāre always thinking about whether people are appropriately involved, and whether people can understand the AI product as well as they need to.
07:11
Lois: You mentioned Gen and Non-Gen AI. Iāve also heard people use the term āClassic AI.ā And lately, a lot more about RAG and Agents. When you're teaching the course, does everybody manage to keep all the terminology straight?
Jeff: Yeah, people usually do a great job with this. I think the trick is, you have to know that you need to know it, if that makes sense.
Lois: I think so, but why donāt you spell it out for us.
Jeff: Well, the temptation is sometimes to leave that stuff to the implementers or product developers, who we know need to have a deep understanding of all of that. But I think what weāve learned is, especially because of all the functional implications, practitioners, product owners, everybody needs to know it too. If for no other reason so they can have more productive conversations with their implementers.
You need to know that Classic or Non-Generative AI leverages machine learning, and that thatās all you need in order to do some incredibly powerful things like predictions and matching.
So in HCM, weāre talking about things like predicting time to hire, identifying suggested candidates for job openings, finding candidates similar to ones you already like, suggesting career paths for employees, and finding recommended successors. All really powerful matching stuff. And all of that stuff uses machine learning and itās certainly AI, but none of that uses Generative AI to do that because it doesnāt need to.
08:38
Nikita: So how does that fit in with all the hype weāve been hearing for a long time now about Gen AI and how itās such a transformative technology thatās going to be more impactful than anything else?
Jeff: Yeah, and that can be true too. And this is what we really lean into when we do the AI in HCM course live. Itās much more of a āright AI for the right jobā kind of proposition.
Lois: So, just like you wouldnāt use a shovel to mix a cake. Use the right tool for the job. I think Iāve got it. So, the Classic AI is whatās driving those kinds of features in HCM? The matching and recommendations?
Jeff: Exactly right. And where we need generative content, thatās where we add on the large language model capability. With LLMs, we get the ability to do natural language processing. So it makes sense that thatās the technology weād use for tasks like āwrite me a job descriptionā or āwrite me performance development tips for my employeeā.
09:33
Nikita: Ok, so how does that fit in with what Lois was asking about RAG and Agents? Is that something people care about, or need to?
Jeff: I think itās easiest to think about those as the āwhatās nextā pieces, at least as it relates to the embedded AI. They kind of deal with the inherent limitations of Gen and Non-Gen components. So, RAG, for example - I know you guys know, but your listeners might not...so whatās RAG stand for?
Lois & Nikita: Retrieval. Augmented. Generation.
Jeff: Hahaha! Exactly. Obviously. But I think everything an HCM person needs to know about that is in the name. So for me, itās easiest to read that one backwards. Retrieval Augmented Generation. Well, the Generation just means itās more generative AI. Augmented means itās supplementing the existing AI. And Retrieval just tells you that thatās how itās doing it. Itās going out and fetching something it didnāt already have in order to complete the operation.
10:31
Lois: And this helps with those limitations you mentioned?
Nikita: Yeah, and what are they anyway?
Jeff: I think an example most people are familiar with is that large language models are trained on this huge set of information. To a certain point. So that model is trained right up to the point where it stopped getting trained. So if youāre talking about interacting with ChatGPT, as an example, itāll blow your doors off right up until you get to about October of 2023 and then, it just hasnāt been trained on things after that. So, if you wanted to have a conversation about something that happened after that, it would need to go out and retrieve the information that it needed.
For us in HCM, what that means is taking the large language model that you get with Oracle, and using retrieval to augment the AI generation for the things that the large language model wouldnāt have had.
11:22
Nikita: So, things that happened after the model was trained? Company-specific data? What kind of augmenting are you talking about?
Jeff: Itās all of that. All those things happen and itās anything that might be useful, but itās outside the LLMās existing scope. So, letās do an example. Letās say you and Lois are in the market to hire someone. Youāre looking for a Junior Podcast Assistant. Weād like the AI in HCM to help, and in order to do that, it would be great if it could not just generate a generic job description for the posting, but it could really make it specific to Oracle. Even better, to Oracle University.
So, youād need the AI to know a few more things in order to make that happen. If it knows the job level, and the department, and the organizationāalready the job posting description gets a lot better. So what other things do you think it might need to know?
12:13
Lois: Umm Iām thinkingā¦does it need to account for our previous hiring decisions? Can it inform that at all?
Jeff: Yes! Thatās actually a key one. If the AI is aware not only of all the vacancies and all of the transactional stuff that goes along with it (like you know who posted it, whatās its metadata, what business group it was in, and all that stuff)...but it also knows who we hired, thatās huge.
So if we put all that together, we can start doing the really cool stuffālike suggesting candidates based not only on their apparent match on skills and qualifications, but also based on folks that weāve hired for similar positions. We know how long it took to make those hires from requisition open to the employeeās first start date. So we can also do things like predicting time to hire for each vacancy we have with a lot more accuracy. So now all of a sudden, weāre not just doing recruiting, but we have a system that accounts for āhow we do it around here,ā if that makes any sense.
But the point is, itās the augmented data, itās that kind of training that we do throughout ingestion, going out to other sources for newer or better information, whatever it is we need. The ability to include it alongside everything thatās already in the LLM, thatās a huge deal.
13:31
Nikita: Ok, so I think the only one we didnāt get to was Agents.
Jeff: Yeah, so this one is maybe a little less relevant in HCMāfor now anyway. But itās something to keep an eye on. Because remember earlier when I described our AI as having a great big brain but no hands?
Lois: Yeah...
Jeff: Well, agents are a way of giving it hands. At least for a very well-defined, limited set of purposes. So routine and repetitive tasks. And for obvious reasons, in the HCM space, that causes some concerns. You donāt want, for example, your AI moving people forward in the recruiting process or changing their status to ānot consideredā all by itself. So going forward, this is going to be a balancing act. When we ask the same thing of the AI over and over again, there comes a point where it makes sense to kind of āsaveā that ask. When, for example, we get the ācompare a candidate profile to a job vacancyā results and we got it working just right, we can create an agent. And just that one AI call that specializes in getting that analysis right. It does the analysis, it hands it back to the LLM, and when the human has had what they need to make sure they get what they need to make a decision out of it, youāve got automation on one hand and human hands on the other...hand.
14:56
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15:26
Nikita: Welcome back! Jeff, youāve mentioned the āTime to Hireā feature a few times? Is that a favorite with people who take your classes?
Jeff: The recruiting folks definitely seem to enjoy it, but I think itās just a great example for a couple of reasons. First, itās really powerful non-generative AI. So it helps emphasize the point around the right AI for the right job. And if weāre talking about things in chronological order, itās something that shows up really early in the hire-to-retire cycle.
And, you know, just between us learning nerds, I like to use Time to Hire as an early example because it gets folks in the habit of working through some use cases. You donāt really know if a feature is going to get you what you need until youāve done some of that.
So, for example, if I tell you that Time to Hire produces an estimated number of days to your first hire. And youāre still Lois, and youāre still Niki, and youāre hiring for a Junior Podcast Assistant. So why do you care about time to hire? And Iām asking you for realāWhat would you do with that prediction if you had it?
16:29
Nikita: I guess Iād know how long it is before I can expect help to arrive, and I could plan my work accordingly.
Jeff: Absolutely. What else. What could you do with a prediction for Time to Hire?
Lois: Think about coverage?
Jeff: Yeah! Exactly the word I was looking for. Say more about that.
Lois: Well, if I know itās gonna be three months before our new assistant starts, I might be able to plan for some temporary coverage for that work. But if I had a prediction that said itās only going to be two weeks before a new hire could start, it probably wouldnāt be worth arranging temporary coverage.
Niki can hold things down for a couple of weeks.
Jeff: See, Iām positive she could! Thatās absolutely perfect! And I think thatās all you really need to have in terms of prerequisites to understand any of the AI features in HCM. When you know what you might want to do with it, like predicting the need for temp cover, and youāve got everything we talked about in the foundation part of the courseāthe Gen and the Classic, all that stuff, you can look at a feature like Time to Hire and then you can probably pick that up in 30 seconds.
17:29
Nikita: Can we try it?
Jeff: Sure! I mean, you know, weāre not looking at screens for this conversation, but we can absolutely try it. Youāre a recruiter. If I tell you that Time to Hire is a feature that you run into on the job requisition and it shows you just a few editable fields, and then of course, the prediction of the number of days to hireātell me how you think that feature is going to work when you get there.
Lois: So, what are the fields? And does it matter?
Jeff: Probably not really, but of course you can ask. So, let me tell you. Ready? The fieldsāthey are these. Requisition Title, Location, and Education Level.
Nikita: Ok, well, I have to assume that as I change those thingsā¦ like from a Junior Podcast Assistant to a Senior Podcast Assistant, or change the location from Redwood Shores to Detroit, or change the required education, the time to hire is going to change, right?
Jeff: 100%, exactly. And it does it in real time as you make those changes to those values. So when you pick a new location, you immediately get a new number of days, so it really is a useful tool.
But how does it work? Well, we know itās using a few fields from the job requisition, but thatās not enough. Besides those fields, what else would you need in order to make this prediction work?
18:43
Lois: The part where it translates to a number of days. So, this is based on our historic hiring data? How long it took us to hire a podcast assistant the last time?
Jeff: Yep! And now you have everything you need. We call that āhistoric data from our companyā bit āingestion,ā by the way. And thereās always a really interesting discussion around that when it comes up in the course. But itās the process we use to bring in the HCM data to the AI so it can be considered or predictions exactly like this.
Lois: So itās the HCM data making the AI smarter and more powerful.
Nikita: And tailored.
Jeff: Exactly, itās all of that. And obviously, the HCM is better because weāve given it the AI. But the AI is also better because it has the HCM in it.
But look, I was able to give you a quick description of Time to Hire, and you were able to tell me what it does, which data it uses, and how it works in just a few seconds.
So, thatās kind of the goal when we teach this stuff. Itās getting everybody ready to be productive from moment #1 because what is it and how does it work stuff is already out of the way, you know?
19:52
Lois: I do know!
Nikita: Can we try it with another one?
Jeff: Sure! How about we do...Suggested Candidates.
Lois: And youāre going to tell us what we get on the screen, and we have to tell you how it works, right?
Jeff: Yeah, yeah, exactly. OkāSuggested Candidates. Youāre a recruiter or a hiring manager. You guys are still looking for your Junior Podcast Assistant. On the requisition, youāve got a section called Suggested Candidates. And you see the candidateās name and some scores.
Those scores are for profile match, skills match, experience match. And thereās also an overall match score, and the highest rated people you notice are sorted to the top of the list. So, you with me so far?
Lois: Yes!
Jeff: So you already know that itās suggesting candidates. But if you care about explainability and transparency like we talked about at the start, then you also care about where these suggested candidates came from. So letās see if we can make progress against that. Letās think about those match scores. What would you need in order to come up with match scores like that?
20:54
Nikita: Tell me if Iām oversimplifying this, but everything about the job on the requisition, and everything about the candidate? Their skills and experience?
Jeff: Yeah, thatās actually simplified pretty perfectly. So in HCM, the candidate profile has their skills and experience, and the req profile has the req requirements.
Lois: So weāre comparing the elements of the job profile and the person/candidate profile. And theyāre weighted, I assume?
Jeff: Thatās exactly how it works. See, 30 seconds and you guys are nailing these! In fairness, when we discuss these things in the course, we go into more detail. And I think itās helpful for HCM practitioners to know which data from the person and the job profiles is being considered (and sometimes just as important, which is not being considered). And donāt forget weāre also considering our ingested data. Our previously selected candidates.
21:45
Lois: Jeff, can I change the weighting? If I care more about skills than experience or education, can I adjust the weighting and have it re-sort the candidates?
Jeff: Super important question. So let me give you the answer first, which is āno.ā But because itās important, I want to tell you more. This is a discussion we have in the class around Oracleās Embedded vs. Custom AI. And theyāre both really important offerings. With Embedded, what weāre talking about are the features that come in HCM like any other feature.
They might have some enablement steps like profile options, and thereās an activation panel. But essentially, thatās it. Thereās no inspection panel for you to open up and start sticking your screwdriver in there and making changes. Believe it or not, thatās a big advantage with Embedded AI, if you ask me anyway.
Nikita: Itās an advantage to not be able to configure it?
Jeff: In this context, I think you can say that it is. You know, we talk about the advantages about the baked-in, Embedded AI in this course, but one of the key things is that itās pre-built and pre-tested. And the big one: that itās ready to use on day one. But one little change in a prompt can have a pretty big butterfly effect across all of your results. So, Oracle provides the Embedded AI because we know it works because weāve already tested it, and itās, therefore, ready on day one.
And I think that story maybe changes a little bit when you open up the inspection panel and bust out that screwdriver. Now youāre signing up to be a test pilot. And thatās just fundamentally different than āpre-built and ready on day one.ā Not that itās bad to want configuration.
23:24
Lois: Thatās what the Custom AI path and OCI are about though, right? For when customers have hyper-specific needs outside of Oracleās business processes within the apps, or for when that kind of tuning is really required. And your AI for HCM courseāthat focuses on the Embedded AI instead of Custom, yes?
Jeff: That is exactly it, yes.
Nikita: You said there are about 30 of these AI features across HCM. So, when you teach the course, do you go through all of them or are there favorites? Ones that people want to spend more time on so you focus on those?
Jeff: The professional part of me wants to tell you that we do try to cover all of them, because that explainability and transparency business we talked about at the beginning. Thatās for real, so I want our customers to have that for the whole scope.
24:12
Nikita: The professional part? Whatās the other part?
Jeff: I guess thatās the part that says sure, we need to hit all of them. But some of them are just inherently more fun to work on. So, itās usually the learners who drive that in the live classes when they get into something, thatās where we spend the most time. So, I have my favorites too. The learners have their favorites. And we spend time where itās everybodyās favorite.
Lois: Like where?
Jeff: Ok, so one is far from the most complex one, but I think itās really elegant in its simplicity. And itās the Celebrate feature, where we do employee recognition. Thereās an AI Assist available there. So when itās time to recognize a colleague, you just need to enter the headline or the title, and the AI takes it from there and just writes up the recognition.
24:56
Lois: What about that makes it a good example, Jeff? You said itās elegant. What do you mean?
Jeff: I think itās a few things. So, start with the prompt. Itās just the one lineājust the headline. And thatās your one input. So, type in the headline, get the recognition below. Itās a great demonstration of not just the simplicity, but the power we get out of that simplicity. I always ask it to recognize my employees for implementing AI features in Oracle HCM, just to see what it comes up with.
When it tells the employee that theyāre helping the company by automating routine tasks, bringing efficiency to the HR department, and then launches into specific examples of how AI features help in HCM, it really is pretty incredible. So, itās a simple demo, but it explains a lot about how the Gen AI works.
Lois: Thatās really cool.
25:45
Nikita: So this one is generative AI. Itās using the large language model to create the recognition based on the prompt, which is basically just whatever you entered in the headline. But how does that help explain how Gen AI works in HCM?
Jeff: Well, letās take our simple prompt for example. Thereās a lot happening behind the scenes. Itās taking our prompt, itās doing its LLM thing, but before itās done, itās creating the results in a very specific way. An employee recognition reads really differently than a job description. So, I usually describe this as the hidden part of our prompt. The visible part is what we typed. But it needs to know things like our desired output format. Make sure to use the personās name, summarize the benefits, and be sure to thank them for their contribution, that kind of stuff. So, those things are essentially hard-coded into the page. And thatās to say, this is another area where we donāt get an inspection panel that lets us go in and tweak the prompt.
26:42
Nikita: And thatās generally how generative AI works?
Jeff: Pretty much. Wherever you see an AI Assist button in HCM, thatās more or less whatās going on. And so when you get to some of the other more complex features, itās helpful to know that that is whatās going on.
Lois: Like where?
Jeff: Well, it works that way for the About Me part of your employee profile, for goal creation in performance, and I think a really great example is in performance, where managers are providing the competency development tips.
So the prompt there is a little more complex there because it involves the employeeās proficiency rating instead of free text. But still, pretty straightforward. Youāre gonna click AI Assist and itās gonna generate all the development tips for any specific competency listed for that employee. Good development tips. Five of them. Nicely formatted with bullet points. And these arenāt random words assembled by an AI. So they conform to best practices in the development of competencies. So, something is telling the LLM to give us results that are that good, in that particular way.
So, itās just another good example of the work AI is doing while protected behind the inspection panel that doesnāt exist. So, the coding of that page, in combination with what the LLM generates and the agent that it uses, is what produces the result. Thatās generally the approach. In the class, we always have a good time digging into what must be going on behind that inspection panel. Generally speaking, the better feel we have for whatās going on on these pages, the better weāre able to get the results we want, even without having that screwdriver out.
28:21
Nikita: So itās time well-spent, looking at all the individual features?
Jeff: I think so, especially if youāre anticipating really using any of them. So, the good news is, once you learn a few of them and how they work, and what theyāre best at, you stop being surprised after a while. But there are always tips and tricks. And like we talked about at the top, explainability and transparency are absolutely key. So, as much as Iām not a fan of the phrase, I do think this is kind of a āknowledge is powerā kind of situation.
28:51
Nikita: Sadly, weāre just about out of time for this episode.
Lois: Thatās too bad, I was really enjoying this. Jeff, you were just talking about knowledgeāwhere can we get more?
Jeff: Well, like you mentioned at the start, check out the AI in HCM course on MyLearn. Itās about an hour and a half, but it really is time well spent. And we get into detail on everything the three of us discussed here today, and then we have demoscussions of every feature where we show them and how they work and which data theyāre using and a whole bunch more. So, thereās that. Plus, I hear the instructor is excellent.
Lois: I can vouch for that!
Jeff: Well, then you should definitely look into Dynamic Skills. Different instructor. But we have another course, and again I think about an hour and a half, but when youāre done with the AI course, I always feel like Dynamic Skills is where you really wanna go next to really flesh out all the Talent Management ideas that got stirred up while you were having a great time in the AI course.
And then finally, the live classes. Itās always really fun to take live questions while we talk about AI in HCM.
29:54
Nikita: Thanks, Jeff! This has been really interesting.
Lois: Yeah, thanks for being here, Jeff. Weāve loved having you on.
Jeff: Thank you guys so much for having me. Itās been a pleasure.
Lois: If you want to learn more about what we discussed, go to the show notes for todayās episode. Youāll find links to the AI for Human Capital Management and Dynamic Skills courses that Jeff mentioned so you can check them out. You can also head over to mylearn.oracle.com to find the live sessions for MyLearn subscribers that Jeff conducts.
Nikita: Join us next week as we kick off our āBest of 2024ā season, where weāll be revisiting some of our most popular episodes of the year. Until then, this is Nikita Abrahamā¦
Lois: And Lois Houston, signing off!
30:35
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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Lois Houston and Nikita Abraham continue their deep dive into Oracle Database 23ai backup and recovery strategies with Senior Principal Database & MySQL Instructor Bill Millar. Picking up from Part 1, they explore critical concepts such as instance recovery, checkpoint processes, and the role of redo log files. Bill shares insights into complete and incomplete recovery, flashback technologies, and lots more. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-backup-and-recovery/141127/ Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ Twitter: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, Radhika Banka, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
āØ00:26Nikita: Welcome back to the Oracle University Podcast! Iām Nikita Abraham, Team Lead of Editorial Services with Oracle University, and with me is Lois Houston, Director of Innovation Programs.
Lois: Hi everyone! Last week, we had a fantastic chat with Bill Millar, our Senior Principal Database & MySQL Instructor. We dug into the basics of backup and recovery. We touched on everything from a DBAās role in preventing data loss to handling different types of failures, and even some common mistakes that tend to pop up when managing a database.
Nikita: Yeah, if you missed that episode, definitely go back and check it out. Itās packed with useful info, especially if youāre in charge of keeping databases safe.
01:10
Lois: Today, weāre picking up where we left off. Weāre going to ask Bill about instance recovery and recovery strategies. Bill, can you kick things off by explaining what instance recovery is?
Bill: You can understand instant recovery by becoming familiar with the checkpoint process, the redo log files, and the role of the log writer with the redo log files.
Automatically instance or crash recovery. What is it doing? What are the phases of instance recovery? How we possibly can tune that instance recovery. We can use the mean time to recovery advisor that can help us determine how we might tune the instance recovery.
01:51
Nikita: OK, so letās go through some of these concepts and procedures you mentioned. What is the checkpoint process responsible for exactly?
Bill: The checkpoint process itself, it's responsible for updating the data file headers with checkpoint information. When a checkpoint is taken, it is going to write into the controlfiles. It tells the DB writer to write. DB writer writes to the data files, and the checkpoint is also annotated in the data files.
So updating controlfiles with that checkpoint information also, controlfiles and database files. It signals that DB writer at full check points again, hey, it's time to write. So that way, it has the latest data written to the data files. The controlfile and datafiles, those are in sync with that.
02:40
Lois: Bill, what about the log writer process and the redo log files?
Bill: With the log writer process and the redo log files, the redo log files record the changes to the database himself. It should be multiplexed.
02:53
Nikita: What do you mean by that?
Bill: More than one redo log group. Now, the redo log groups, it is recommended that they should be multiplexed. Each group member should be on a different disk or in a different disk group if you're using ASM.
03:10
Nikita: And why is that, Bill?
Bill: Because if I lose one, if I lose one redo log group, one member, I can continue to operate with just the one. If I only have one redo log group member and the system comes around and tries to write to it, then my system is going to come to a halt.
So the log writer is going to write to those redo logs whenever somebody does a commit. When that redo log buffer is 1/3 full or every three seconds and before DB writer writes. So those are the four mechanism that tells log writer to write from that log buffer to the redo log files. And it'll also write, when we do a shut down, all the buffers will be flushed. And so that way, everything will be in sync when the system is shut down.
04:01
Lois: What are the different modes of operation for a database, Bill? And how do these modes impact the recovery capabilities of the database?
Bill: So we have two different modes we can operate in. One is called NOARCHIVELOG mode. It is the default. ARCHIVELOG mode, highly encouraged. But not every environment has to be in ARCHIVELOG mode.
04:21
Nikita: So with ARCHIVELOG modeā¦
Bill: Closed database. You have to close it, recover to the last backup. That's as far as I can go. Actually, I could, depending on what happens, I might be able to apply some redo.
Suitable for training and test environments or for data warehouses, we don't have a lot of frequent changes. It's mainly bulk loading data at night and querying during the day. So it might be appropriate for that.
Because ARCHIVELOG mode, it is a little overhead. Yes. So with that database, it goes down while it's open. The system, when it comes up, it can recover to the last committed transaction. And this is usually the mode we want to operate in for production environments.
So we have that data in the buffer cache. We have that redo being buffered. We have the undo tablespace, keeping track of what the data was before a change. The redo keeps track of what was the change.
And if we're in ARCHIVELOG mode, as we switch from one redo log to another, we will generate what's referred to as archived log files, and that's what allows us to do a complete recovery.
05:33
Lois: What happens in the case of automatic instance recovery?
Bill: For an automatic instance recovery or crash recovery, our system went down unexpectedly. Because it did not do a clean shutdown, the buffers were not flushed. Everything was not synchronized. So the datafile, controlfile, everything is out of sync.05:53
Nikita: So, how do the files get synchronized then?
Bill: It uses the redo log groups to synchronize the files. It's going to roll forward. It rolls forward the changes that were made. So due to different distinct operations. Roll forward applies committed and uncommitted data. And the redo does not keep track of what was committed and uncommitted.
It'll keep track of, hey, I had this transaction, hey, here's a commit for that transaction. But hey, I have a transaction. That was never uncommitted. That's the job of the undo. But rolls forward all those changes. And then anything that did not actually receive a commit, it will roll back the uncommitted data, return to the original state. And that is the job of the undo tablespace.
06:37
Lois: Bill, is it possible to tune instance recovery for better performance?
Bill: You can try to tune this instance recovery. Tuning it is touchy. Be careful because you can cause more harm than what you think you might be doing good. The instance recovery, what we're doing, we're trying to-- the transactions between checkpoints. When was the last checkpoint?
Because the items between the checkpoints, that's what has to be reapplied. So the last checkpoint to the last redo log, what is that time frame there between those? Well, what we're going to do, we're going to try to control that. We're going to try to control the difference between the checkpoint and the end of the redo log.
There is a mean-time recovery advisor. You specify the desired times in seconds or minutes that how often you want that checkpoint to occur.
There is a parameter, FAST_START_MTTR parameter that you can set. The default value is zero saying, hey, I'm going to let the system take care of it. And the maximum you can set it is to one hour.
07:46
Nikita: And why 1 hour?āØ
Bill: The reason being, if I set that to one hour and I have a lot of activity, how long is it going to take? How many transactions can happen within that hour? Yeah, I'm not doing a checkpoint as often, so I'm eliminating that workload. But if it has to recover, how long is it going to take?
If I set it too small, the system says, hey, right now, it's going to take me 19 seconds based off statistics. If I said, OK, I want it in five seconds. So what does that mean? Every five seconds, I'm saying do a checkpoint. So what is it doing? OK, time to do a checkpoint.
OK, time to go ahead and OK, DB writer write. OK, log writer write. OK, let me update the datafiles and the controlfiles. So you're just thrashing your system. So be careful if you decide to try to manually tune it.
And when you go out and look at this mean time to recover, and even if you do it through the command line, you'll see that, that value is most likely going to change throughout the day, depending on the workload that you have.
08:46
Lois: How does the process of restoring and recovering data typically work?
Bill: So when we restore, we're restoring our datafiles. All the datafiles, tablespace, controlfiles, archived redo log, server parameter file. Then when we recover, it involves depending on the backup that we use and other factors in there, it is going to apply the redo.
So automatically done by RMAN. So I tell it, this is what I want to do. Hey, I want to restore a database. OK, RMAN says, all right, what backup are you going to use? What is it I need to restore? And then we tell it to recover. OK, I know what I need to use to recover.
So RMAN can do the work for you. So when we restore and recover due to a manual process and there's different methods that we can use, and depending on the failure, we'll drive what type of restore and recovery we might perform.
09:40
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10:22Nikita: Welcome back! Can you talk about the different types of recovery scopes, Bill? How do they compare?
Bill: Recovery can have two kinds of scope. All right. One is the complete recovery. We are getting the database back to the current time of the crash with no loss of data. We're going to again bring everything back to the present.
Incomplete or point-in-time recovery. We're going to take a database or maybe a tablespace or even a table back to a point-in-time in the past. So from the time that we select to take it to recover, everything that was done after that is null and void, is gone missing. That's why it's called incomplete recovery, because it's not complete.
11:09
Lois: What are the steps that take place during complete recovery?
Bill: We restore the datafiles. Changes are applied. We're applying the redo. The datafiles contained committed and uncommitted transactions. The undo is applied. Anything that did not receive an actual commit will take back to the original value. And we have our datafiles recovered.
11:33
Nikita: And what about point-in-time recovery?
Bill: Point-in-time recovery, very similar. We're going to restore the datafiles from as far back as necessary. Changes are applied. So the data files are going to contain the committed and uncommitted up to that point-in-time. Database is open, that redo, that undo, anything that did not actually receive a commit. The undo is applied. The point-in-time recovered is complete. We're not applying all the redo, all the changes, only up to the time that we specify.
12:08
Lois: Are there any features that can make point-in-time recovery quicker?
Bill: We also have the ability to use flashback database. It is an optional feature. And it can be a quick way to do that point-in-time recovery. It is an alternative to that database point-in-time recovery we just looked at. Faster. No restore is required. It's going to rewind the database.
It does require some configuration in the environment. We do have to set up in order to use flashback database.
12:41
Nikita: I want to talk about Oracleās data protection solutions, particularly when it comes to backup and recovery or disaster recovery.
Bill: So for physical data protection-- backup and recovery objective. Yep, that works for both physical and logical.
My recovery time, hours to days. Possibly minutes to hours for the logical. And Oracle solution, we have the Recovery Manager that's out of the box, RMAN. Oracle Secure Backup, that is Oracle's media management library system backing up to tape. The logical protection, yes, flashback technologies can help me take care of that very easily.
For disaster recovery, physical data protection, recovery time objective, seconds to minutes. We're not going to accomplish that with RMAN. You're going to want to use our Data Guard with the Active Data Guard feature to be able to switch over to a standby database within seconds of a failure.
13:41
Lois: Why would someone choose to use flashback technologies for recovery, Bill?
Bill: With the flashback technologies, we can use it for viewing data as past dates. What did it look like? We can wind the database back and forth in time. Assist users in an error analysis and recovery, because we have different technologies.
This flashback query, version query, transaction query, those allow me to view what was the value of a row at a time. I can even see what were the changes to a row over a period of time? I can also view the query that caused that change.
For error recovery, I can back out a transaction. I can take a table back to a non-current time. I can also flashback a table that was dropped. And I can also take an entire database by using flashback. So the different recovery options I might have with the flashback technology.
14:44
Lois: Thank you so much, Bill. These last two episodes have been so insightful, right Niki?
Nikita: I couldnāt agree more, Lois! If you want to know more about backup and recovery configuration and other concepts, visit mylearn.oracle.com and search for the Oracle Database 23ai: Backup and Recovery course. Our upcoming episode is a very special one, where weāll be discussing Oracle AI in Fusion Cloud Human Capital Management. So, watch out for that! Until next week, this is Nikita Abrahamā¦
Lois: And Lois Houston, signing off!āØ
15:16
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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In this two-part special, Lois Houston and Nikita Abraham delve into the critical topic of backup and recovery in Oracle Database 23ai. Together with Bill Millar, Senior Principal Database & MySQL Instructor, they discuss the role of database administrators, strategies for protecting data, and dealing with various types of data failure. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-backup-and-recovery/141127/ Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ Twitter: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, Radhika Banka, and the OU Studio Team for helping us create this episode. ---------------------------------------------------------
Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26Nikita: Welcome to the Oracle University Podcast! Iām Nikita Abraham, Team Lead of Editorial Services with Oracle University, and with me is Lois Houston, Director of Innovation Programs.
Lois: Hi there! For the last two weeks, weāve been having really exciting discussions on Oracle AI Vector Search. We covered the fundamentals, benefits, the vector workflow, and lots more. Today, weāre going to talk about backup and recovery in Oracle Database 23ai with Bill Millar. If youāve been listening this season, youāll know that Bill is a Senior Principal Database & MySQL Instructor with Oracle University.
Nikita: In this two-part special, weāll dive into some of the things you need to know about backup and recovery, especially if youāre a database and backup admin. So, if you're the person in charge of keeping data safe and handling disaster recovery, this is definitely worth your time.
01:20
Lois: Thatās right, Niki. Hi Bill, thanks for joining us again. Whatās the role of a Database Administrator, or DBA, when it comes to backup and recovery?
Bill: The DBA is typically responsible for ensuring the database is open and available when needed and at times you need to work with system administrators and other people within your organization to achieve that. But we want to try to protect the database from failure wherever possible.
We want to increase the mean time between failures. Hopefully, we don't have failures, and we have to increase that time. But it might mean that we need to ensure we have redundant hardware and that in place, again, maybe out of the realm of the DBA, but people within your organization can help with that. We want to protect those critical components by using the redundancy. And we want to decrease the mean time to recover. Failures happen, but how fast can we get access back to that data after that failure.
The faster we can do it, the happier customers are. Minimize the loss of data. It's never good to lose data, especially in a critical environment, but maybe in test and development, maybe not so bad.
02:39
Nikita: How do we ensure a separation of duties for backup and recovery processes?Bill: For a separation of duties, we do have a user called SYSBACKUP. It has the privileges that's required to perform backup and recoveries, the privilege to connect and execute the commands in what we refer to as RMAN, our Recovery Manager. As I said, it has permissions for backup and recovery because you do need to shut down the database, start up the database, those type of things.
We're able to connect to that closed database to try to troubleshoot it, to get it to the open state again. It does not include any privileges to access data. The SYSBACKUP user is created when we install the database, when we create the database. We can use it explicitly for privileged user connection. It allows us to connect to the database. So RMAN connects as SYSBACKUP.
03:37
Lois: Bill, what should people keep in mind when figuring out whatās considered critical data?
Bill: You want to try to identify your critical data. Some data might be highly required to access and make sure we don't lose don't lose data, but then you might have some environments. OK, I don't need to have them up and running as fast. If we lose a little data, it may not hurt, but we want to identify the difference in the different data that we have on different environments.
So we want to also prioritize that critical data, which data do we need access to first because how much will the company lose per hour of downtime because we can't do business. We want to make sure the access data protection requirements. Not everybody has access to everything. And there are different types of disaster that can happen that are going to be totally out of your control. There's the physical disaster, a hurricane or tornado, outages, power outages, component failures, failures within the building itself, corruption of data because of some of these failures.
And then, the most dreaded one, the one that happens most often, usually those human errors, the logical errors, where the data is just bad, we are able to access and everything. It's just that something has changed that shouldn't have been changed. We want to make sure we access our recovery requirements.
05:04
Lois: So, what are they? What are those requirements?
Bill: We want to base that requirement based on how critical is that data, how soon do we need to have access to that? What is our recovery point objective?
Do we have a tolerance for any type of data loss? How frequently should we backups? How often they should be taken? What type of backups will be another thing we'll want to figure out? Is point-in-time recovery required? Are we able to or do we ever need to go back to a previous point in time to do something? It's not always just recovery for a database failure. We might need to do a recovery point in time to a different system so we can investigate something. What is my recovery time objective? Again, what is the tolerance for the downtime? How long can I be down?
The downtime, the biggest part of when a system goes down is trying to identify what is the problem, then next is what is going to be my plan to recover, and then perform in the recovery. We might have a tiered required time objective based off of critical data, and then depending on the failure. Is that failure at the entire database? Is it just a tablespace? Is it just a table? Is it just a row? That also determines how long it takes to recover and what type of recovery we might try to perform.
What is my backup retention policy? Do I have a requirement to where I have to have my backups off site? And it doesn't mean like back in the old days of mainframe computers, you'd back up to tape and you'd take those tapes off site. You might still do that today. Or, am I backing up to a cloud environment? So what do I need to have for that? What about long-term backups? We work with our day-to-day backups, but there's those backups that require for longer, archives like end of year backups. Some places require to keep their end of year backup for like 10 years. How are we going to handle that? So these are some of the things that we have to think about when we start talking about backup and recovery.
07:23
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08:04
Nikita: Welcome back! Bill, I want to talk about the different failures that can occur in an Oracle database. How would you categorize them?
Bill: There are different category of failure. This is not an all-inclusive list by any means. It's just something that possibly can happen. So they can usually be divided into different categories like statement failure. All right. When doing a select and insert, update, delete, the statement itself fails. A user process fails. Single database session fails for some reason. Network failure, connectivity is lost. The user error, probably one of the most common ones we have to deal with. A user successfully completes an operation, but that operation was erroneous. They dropped the wrong table, updated the wrong row.
Then there's the instance failure. The database itself shuts down unexpectedly. And then media failure, usually a hard failure of our disk. Something of memory, something failed and caused an error.
09:12
Lois: Ok. I want to dive a little deeper into each of these categories that you mentioned. Letās start with statement failures. What are typical problems that one might face?
Bill: Attempts to enter invalid data into a table. They're trying to put a numeric field in a date field, and usually just working with the user is going to correct that. Is that the DBA responsible? Yes, no, maybe. They attempt to form operations with insufficient privileges. Attempts to allocate space that fails, well, that depends on are they going-- do they have unlimited storage or do they have a limit? Logic errors in the application. Well, that's where we're going to have to work with those developers to try to correct those type of errors.
09:59
Nikita: What about user process failures?
Bill: User performs an abnormal disconnect, doesn't close out properly. It can cause something to hang up or even possibly erroneous data to be updated. A user session is abnormally terminated. Well, usually, we don't have to try to resolve those user type errors, but something we might need to look into.
A user experiences a program error that terminates the session. Again, usually it's the application developers, but it's something as a DBA, we might want to keep an eye on. Is it the same person? Is it from the same location? Is it the same module within that application? Maybe there's some things we can help to identify what the possible problem can be.
10:43
Nikita: Bill, tell us about common issues that can lead to network failures. What can we do to mitigate these problems and ensure network resilience?
Bill: The listener fails. Well, we can connect a backup listener and configure how it can connect time failover can work. A network interface card fails. Well, again, we're not the hardware people, but can we work with our network, our server team, whatever, to possibly have redundant network cards? The network connection fails itself. Can we configure a backup network connection?
11:18
Lois: And what about user errors? How can we recover from those types of scenarios?
Bill: The user inadvertently deletes or modifies data. Well, we have some things we'll look at as far as like rollback a transaction along with the dependent transactions. Rewind that table back to where it should have been.
You're also can use LogMiner. You can look at our redo logs to try to figure out where that bad transaction was.
User drops a table inadvertently. Well, we can recover the table from the recycle bin if we have the recycle bin on or we may need to recover from a backup.
11:56
Nikita: What are common causes of instance failures, Bill?
Bill: The dreaded power outage. Well, hopefully, we have some type of up system to keep us running, even if it's not for continuous operation. Maybe if it's just to allow us to gracefully take a system down. The dreaded hardware failure. If you have a way to predict a hardware failure, you can make a lot of money. Always happens at the most inopportune times. But then again, do we have redundant hardware? Do we have something in place to help allow us to continue to operate in case of a hardware failure?
Failure of one of the critical background processes. Why did it fail? We can go out. We can look at our alert log, we have trace files. And then we have, you have the Enterprise Manager Cloud Control. We can do the same thing as looking at the alert log and trace files. But the Enterprise Manager Cloud Control gives us a GUI interface to allow us to do that.
12:53
Lois: Before we let you go, Bill, can you tell us about media and data failures?
Bill: Failure of a disk drive, failure of a disk controller, deletion or corruption of a file needed for database operation, well, this is the dreaded media failure. So we're going to restore from a backup. If we need to move, we can move a data file to a different location. We can notify, hey, here's that new location. And then recover by applying any of the incremental backups, any of the redo to get it back to where it should be.
And then we have the data failures. We can't access the component, missing data files at OS level. And maybe our system administrators deleted something thinking it wasn't needed, or maybe even a developer on a development type system. Don't have the right permissions. Tablespace is offline. Well, why is it offline? Did somebody took the wrong tablespace offline? We have physical corruptions, block checksum failures. It's inconsistent between the header and footer. Invalid block header field values, like all of them are zeroed out.
Then we have the logical corruptions, inconsistent dictionary, corrupt row piece, the inconsistencies, a control file not synchronized with the data files, usually because we recovered something and didn't do it the right way. I/O failures, maybe we just exceeded the number of open files that we're allowed to have. Maybe it's just a network or an I/O error itself. And these are different types of failures that you might experience. Again, it's not an all-inclusive list. It's just a few examples.
14:41
Nikita: I know you said itās not an all-inclusive list and you were just giving us a few examples, but that seemed quite thorough! Thank you so much, Bill, for walking us through all of that today!
Lois: Yeah, I totally agree! Thanks Bill! For more on what we discussed today, visit mylearn.oracle.com. Search for the Oracle Database 23ai: Backup and Recovery course. Next week, weāll get into instance recovery and recovery strategies. Until then, this is Lois Houstonā¦
Nikita: And Nikita Abraham, signing off!
15:15
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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This week, Lois Houston and Nikita Abraham continue their exploration of Oracle AI Vector Search with a deep dive into vector indexes and memory considerations. Senior Principal APEX and Apps Dev Instructor Brent Dayley breaks down what vector indexes are, how they enhance the efficiency of search queries, and the different types supported by Oracle AI Vector Search. Oracle Database 23ai: Oracle AI Vector Search Fundamentals: https://mylearn.oracle.com/ou/course/oracle-database-23ai-oracle-ai-vector-search-fundamentals/140188/ Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ Twitter: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, Radhika Banka, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26
Nikita: Welcome back to the Oracle University Podcast! Iām Nikita Abraham, Team Lead of Editorial Services at Oracle University, and with me is Lois Houston, Director of Innovation Programs.Lois: Hi everyone! Last week was Part 1 of our discussion on Oracle AI Vector Search. We talked about what it is, its benefits, the new vector data type, vector embedding models, and the overall workflow. In Part 2, weāre going to focus on vector indices and memory.
00:56
Nikita: And to help us break it all down, weāve got Brent Dayley back with us. Brent is a Senior Principal APEX and Apps Dev Instructor with Oracle University. Hi Brent! Thanks for being with us today. So, letās jump right in! What are vector indexes and how are they useful?
Brent: Now, vector indexes are specialized indexing data structures that can make your queries more efficient against your vectors. They use techniques such as clustering, and partitioning, and neighbor graphs. Now, they greatly reduce the search space, which means that your queries happen quicker. They're also extremely efficient. They do require that you enable the vector pool in the SGA.
01:42
Lois: Brent, walk us through the different types of vector indices that are supported by Oracle AI Vector Search. How do they integrate into the overall process?
Brent: So Oracle AI Vector Search supports two types of indexes, in-memory neighbor graph vector index. HNSW is the only type of in-memory neighbor graph vector index that is supported. These are very efficient indexes for vector approximate similarity search. HNSW graphs are structured using principles from small world networks along with layered hierarchical organization.
And neighbor partition vector index, inverted file flat index, is the only type of neighbor partition index supported. It is a partition-based index which balances high search quality with reasonable speed.
02:35
Nikita: Brent, you mentioned that enabling the vector pool in the SGA is a requirement when working with vector indexes. Can you explain that process for us?
Brent: In order for you to be able to use vector indexes, you do need to enable the vector pool area. And in order to do that, what you need to do is set the vector memory size parameter.
You can set it at the container database level. And the PDB inherits it from the CDB. Now bear in mind that the database does have to be balanced when you set the vector pool.
03:12
Lois: Ok. Are there any other considerations to keep in mind when using vector indices?
Brent: Vector indexes are stored in this pool, and vector metadata is also stored here. And you do need to restart the database. So large vector indexes do need lots of RAM, and RAM constrains the vector index size. You should use IVF indexes when there is not enough RAM. IVF indexes use both the buffer cache as well as disk.
03:42
Nikita: And what about memory considerations?
Brent: So to remind you, a vector is a numerical representation of text, images, audio, or video that encodes the features or semantic meaning of the data, instead of the actual contents, such as the words or pixels of an image. So the vector is a list of numerical values known as dimensions with a specified format.
Now, Oracle does support the int8 format, the float32 format, and the float64 format. Depending on the format depends on the number of bytes. For instance, int8 is one byte, float32 is four bytes. Now, Oracle AI Vector Search supports vectors with up to 65,535 dimensions.
04:34
Lois: What should we know about creating a table with a vector column?
Brent: Now, Oracle Database 23ai does have a new vector data type. The new data type was created in order to support vector search.
The definition can include the number of dimensions and can include the format. Bear in mind that either one of those are optional when you define your column. The possible dimension formats are int, float 32, and float 64. Float 32 and float 64 are IEEE standards, and Oracle Database will automatically cast the value if needed.
05:18
Nikita: Can you give us a few declaration examples?
Brent: Now, if we just do a vector type, then the vectors can have any arbitrary number of dimensions and formats. If we describe the vector type as vector * , *, then that means that vectors can have an arbitrary number of dimensions and formats. Vector and vector * , * are equivalent. Vector with the number of dimensions specified, followed by a comma, and then an asterisk, is equivalent to vector number of dimensions.
Vectors must all have the specified number of dimensions, or an error will be thrown. Every vector will have its dimension stored without format modification. And if we do vector asterisk common dimension element format, what that means is that vectors can have an arbitrary number of dimensions, but their format will be up-converted or down-converted to the specified dimension element format, either INT8, float 32, or float 64.
06:25
Working towards an Oracle Certification this year? Take advantage of the Certification Prep live events in the Oracle University Learning Community. Get tips from OU experts and hear from others who have already taken their certifications. Once youāre certified, youāll gain access to an exclusive forum for Oracle-certified users. What are you waiting for? Visit mylearn.oracle.com to get started.
06:52
Nikita: Welcome back! Brent, what is the vector constructor and why is it useful?
Brent: Now, the vector constructor is a function that allows us to create vectors without having to store those in a column in a table. These are useful for learning purposes. You use these usually with a smaller number of dimensions. Bear in mind that most embedding models can contain thousands of different dimensions. You get to specify the vector values, and they usually represent two-dimensional like xy coordinates. The dimensions are optional, and the format is optional as well.
07:29
Lois: Right. Before we wrap up, can you tell us how to calculate vector distances?
Brent: Now, vector distance uses the function VECTOR_DISTANCE as the main function. This allows you to calculate distances between two vectors and, therefore, takes two vectors as parameters. Optionally, you can specify a metric. If you do not specify a metric, then the default metric, COSINE, would be used. You can optionally use other shorthand functions, too. These include L1 distance, L2 distance, cosine distance, and inner product. All of these functions also take two vectors as input and return the distance between them. Now the VECTOR_DISTANCE function can be used to perform a similarity search. If a similarity search query does not specify a distance metric, then the default cosine metric will be used for both exact and approximate searches.
If a similarity search does specify a distance metric in the VECTOR_DISTANCE function, then an exact search with that distance metric is used if it conflicts with the distance metric specified in a vector index. If the two distance metrics are the same, then this will be used for both exact as well as approximate searches.
08:58
Nikita: I was wondering Brent, what vector distance metrics do we have access to?
Brent: We have Euclidean and Euclidean squared distances. We have cosine similarity, dot product similarity, Manhattan distance, and Hamming similarity. Let's take a closer look at the first of these metrics, Euclidean and Euclidean squared distances. This gives us the straight-line distance between two vectors. It does use the Pythagorean theorem. It is sensitive to both the vector size as well as the direction.
With Euclidean distances, comparing squared distances is equivalent to comparing distances. So when ordering is more important than the distance values themselves, the squared Euclidean distance is very useful as it is faster to calculate than the Euclidean distance, which avoids the square root calculation.
09:58
Lois: And the cosine similarity metrics?
Brent: It is one of the most widely used similarity metrics, especially in natural language processing. The smaller the angle means they are more similar. While cosine distance measures how different two vectors are, cosine similarity measures how similar two vectors are.
Dot product similarity allows us to multiply the size of each vector by the cosine of their angle. The corresponding geometrical interpretation of this definition is equivalent to multiplying the size of one of the vectors by the size of the projection of the second vector onto the first one or vice versa. Larger means that they are more similar. Smaller means that they are less similar.
Manhattan distance is useful for describing uniform grids. You can imagine yourself walking from point A to point B in a city such as Manhattan. Now, since there are buildings in the way, maybe we need to walk down one street and then turn and walk down the next street in order to get to our result. As you can imagine, this metric is most useful for vectors describing objects on a uniform grid such as city blocks, power grids, or perhaps a chessboard.
11:27
Nikita: And finally, we have Hamming similarity, right?
Brent: This describes where vector dimensions differ. They are binary vectors, and it tells us the number of bits that require change to match. It compares the position of each bit in the sequence. Now, these are usually used in order to detect network errors.
11:53 Nikita: Brent, thanks for joining us these last two weeks and explaining what Oracle AI Vector Search is. If you want to learn more about what we discussed today, visit mylearn.oracle.com and search for the Oracle Database 23ai: Oracle AI Vector Search Fundamentals course.Lois: This concludes our season on Oracle Database 23ai New Features for administrators. In our next episode, weāre going to talk about database backup and recovery, but more on that later! Until then, this is Lois Houstonā¦
Nikita: And Nikita Abraham signing off!
12:29
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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In this episode, Senior Principal APEX and Apps Dev Instructor Brent Dayley joins hosts Lois Houston and Nikita Abraham to discuss Oracle AI Vector Search. Brent provides an in-depth overview, shedding light on the brand-new vector data type, vector embeddings, and the vector workflow. Oracle Database 23ai: Oracle AI Vector Search Fundamentals: https://mylearn.oracle.com/ou/course/oracle-database-23ai-oracle-ai-vector-search-fundamentals/140188/ Oracle Database 23ai: SQL Workshop: https://mylearn.oracle.com/ou/course/oracle-database-23ai-sql-workshop/137830/ Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ Twitter: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, Radhika Banka, and the OU Studio Team for helping us create this episode. --------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26
Lois: Hello and welcome to the Oracle University Podcast! Iām Lois Houston, Director of Innovation Programs here at Oracle University. Joining me as always is our Team Lead of our Editorial Services, Nikita Abraham.
Nikita: Hi everyone! Thanks for tuning in over the last few months as weāve been discussing all the Oracle Database 23ai new features. Weāre coming to the end of the season, and to close things off, in this episode and the next one, weāre going to be talking about the fundamentals of Oracle AI Vector Search. In todayās episode, weāll try to get an overview of what vector search is, why Oracle Vector Search stands out, and dive into the new vector data type. Weāll also get insights into vector embedding models and the vector workflow.
01:11
Lois: To take us through all of this, weāre joined by Brent Dayley, who is a Senior Principal APEX and Apps Development Instructor with Oracle University. Hi Brent! Thanks for joining us today. Can you tell us about the new vector data type?
Brent: So this data type was introduced in Oracle Database 23ai. And it allows you to store vector embeddings alongside other business data. Now, the vector data type allows a foundation to store vector embeddings.
01:42
Lois: And what are vector embeddings, Brent?
Brent: Vector embeddings are mathematical representations of data points. They assign mathematical representations based on meaning and context of your unstructured data. You have to generate vector embeddings from your unstructured data either outside or within the Oracle Database. In order to get vector embeddings, you can either use ONNX embedding machine learning models or access third-party REST APIs. Embeddings can be used to represent almost any type of data, including text, audio, or visual, such as pictures. And they are used in proximity searches.
02:28
Nikita: Hmmm, proximity search. And similarity search, right? Can you break down what similarity search is and how it functions?
Brent: So vector data tends to be unevenly distributed and clustered into groups that are semantically related. Doing a similarity search based on a given query vector is equivalent to retrieving the k nearest vectors to your query vector in your vector space. What this means is that basically you need to find an ordered list of vectors by ranking them, where the first row is the closest or most similar vector to the query vector. The second row in the list would be the second closest vector to the query vector, and so on, depending on your data set. What we need to do is to find the relative order of distances. And that's really what matters rather than the actual distance.
Now, similarity searches tend to get data from one or more clusters, depending on the value of the query vector and the fetch size. Approximate searches using vector indexes can limit the searches to specific clusters. Exact searches visit vectors across all clusters.
03:44
Lois: Ok. I want to move on to vector embedding models. What are they and why are they valuable?
Brent: Vector embedding models allow you to assign meaning to what a word, or a sentence, or the pixels in an image, or perhaps audio. It allows you to quantify features or dimensions. Most modern vector embeddings use a transformer model. Bear in mind that convolutional neural networks can also be used. Depending on the type of your data, you can use different pretrained open source models to create vector embeddings. As an example, for textual data, sentence transformers can transform words, sentences, or paragraphs into vector embeddings.
04:33
Nikita: And what about visual data?
Brent: For visual data, you can use residual network also known as ResNet to generate vector embeddings. You can also use visual spectrogram representation for audio data. And that allows us to use the audio data to fall back into the visual data case. Now, these can also be based on your own data set. Each model also determines the number of dimensions for your vectors.
05:02
Lois: Can you give us some examples of this, Brent?
Brent: Cohere's embedding model, embed English version 3.0, has 1,024 dimensions. Open AI's embedding model, text-embedding-3-large, has 3,072 dimensions.
05:24
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05:50
Nikita: Welcome back! Letās now get into the practical side of things. Brent, how do you import embedding models?
Brent: Although you can generate vector embeddings outside the Oracle Database using pre-trained open source embeddings or your own embedding models, you also have the option of doing those within the Oracle Database. In order to use those within the Oracle Database, you need to use models that are compatible with the Open Neural Network Exchange Standard, or ONNX, also known as Onyx.
Oracle Database implements an Onyx runtime directly within the database, and this is going to allow you to generate vector embeddings directly inside the Oracle Database using SQL.
06:35
Lois: Brent, why should people choose to use Oracle AI Vector Search?
Brent: Now one of the biggest benefits of Oracle AI Vector Search is that semantic search on unstructured data can be combined with relational search on business data, all in one single system. This is very powerful, and also a lot more effective because you don't need to add a specialized vector database. And this eliminates the pain of data fragmentation between multiple systems.
It also supports Retrieval Augmented Generation, also known as RAG. Now this is a breakthrough generative AI technique that combines large language models and private business data. And this allows you to deliver responses to natural language questions. RAG provides higher accuracy and avoids having to expose private data by including it in the large language model training data.
07:43
Nikita: In the last part of our conversation today, I want to ask you about the Oracle AI Vector Search workflow, starting with generating vector embeddings.
Brent: Generate vector embeddings from your data, either outside the database or within the database. Now, embeddings are a mathematical representation of what your data meaning is. So what does this long sentence mean, for instance? What are the main keywords out of it?
You can also generate embeddings not only on your typical string type of data, but you can also generate embeddings on other types of data, such as pictures or perhaps maybe audio wavelengths.
08:28
Lois: Could you give us some examples?
Brent: Maybe we want to convert text strings to embeddings or convert files into text. And then from text, maybe we can chunk that up into smaller chunks and then generate embeddings on those chunks. Maybe we want to convert files to embeddings, or maybe we want to use embeddings for end-to-end search.
Now you have to generate vector embeddings from your unstructured data, either outside or within the Oracle Database. You can either use the ONNX embedding machine learning models or you can access third-party REST APIs.
You can import pre-trained models in ONNX format for vector generation within the database. You can download pre-trained embedding machine learning models, convert them into the ONNX format if they are not already in that format. Then you can import those models into the Oracle Database and generate vector embeddings from your data within the database.
Oracle also allows you to convert pre-trained models to the ONNX format using Oracle machine learning for Python. This enables the use of text transformers from different companies.
09:51
Nikita: Ok, so that was about generating vector embeddings. What about the next step in the workflowāstoring vector embeddings?
Brent: So you can create one or more columns of the vector data type in your standard relational data tables. You can also store those in secondary tables that are related to the primary tables using primary key foreign key relationships.
You can store vector embeddings on structured data and relational business data in the Oracle Database. You do store the resulting vector embeddings and associated unstructured data with your relational business data inside the Oracle Database.
10:30
Nikita: And the third step is creating vector indexes?
Brent: Now you may want to create vector indexes in the event that you have huge vector spaces. This is an optional step, but this is beneficial for running similarity searches over those huge vector spaces.
So once you have generated the vector embeddings and stored those vector embeddings and possibly created the vector indexes, you can then query your data with similarity searches. This allows for Native SQL operations and allows you to combine similarity searches with relational searches in order to retrieve relevant data.
11:15
Lois: Ok. I think Iāve got it. So, Step 1, generate the vector embeddings from your unstructured data. Step 2, store the vector embeddings. Step 3, create vector indices. And Step 4, combine similarity and keyword search.
Brent: Now there is another optional step. You could generate a prompt and send it to a large language model for a full RAG inference. You can use the similarity search results to generate a prompt and send it to your generative large language model in order to complete your RAG pipeline.
11:59
Lois: Thank you for sharing such valuable insights about Oracle AI Vector Search, Brent. We canāt wait to have you back next week to talk about vector indices and memory.
Nikita: And if you want to know more about Oracle AI Vector Search, visit mylearn.oracle.com and check out the Oracle Database 23ai: Oracle AI Vector Search Fundamentals course.
Lois: Yes, and if you're serious about advancing in your development journey, we recommend taking the Oracle Database 23ai SQL workshop. Itās designed for those who might be familiar with SQL from other database platforms or even those completely new to SQL.
Nikita: Yeah, weāll add the link to the workshop in the show notes so you can find it easily. Until next week, this is Nikita Abrahamā¦
Lois: And Lois Houston signing off!
12:45
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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In this episode, Lois Houston and Nikita Abraham explore the Automatic Transaction Quarantine feature with Senior Principal Database & MySQL Instructor, Bill Millar. Bill explains that this feature isolates transactions that could potentially cause system crashes, preventing them from impacting the entire container database. They also discuss the key advantages of automatic transaction quarantine in maintaining database stability and availability. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-new-features-for-administrators/140830/ Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26Nikita: Welcome to the Oracle University Podcast! Iām Nikita Abraham, Team Lead: Editorial Services with Oracle University, and with me is Lois Houston, Director of Innovation Programs.
Lois: Hi there! In our last episode, we looked at an Oracle Database 23ai new feature called Automatic Transaction Rollback, and we spoke about why it is such an important feature for database administrators.
00:51
Nikita: Today, weāre going to talk about another new feature called Automatic Transaction Quarantine. Weāll discuss what it is, go through the steps to monitor and identify quarantine transactions, explore how an issue is resolved once a quarantined transaction has been identified, and end by looking at quarantined transaction escalation, and how it helps to protect not only your PDB, but also your container database.
Lois: Back with us is Bill Millar, our Senior Principal Database & MySQL Instructor with Oracle University. Hi Bill! What is automatic transaction quarantine and why do we need it?
01:27
Bill: The good news is that starting in 23c with the database quarantines, it's going to isolate a transaction or transactions that could possibly cause a system crash, so you can avoid crashes. It's going to isolate those transactions that potentially could cause a problem. However, those transactions must be manually resolved by the DBA so that the row locks are released from those bad transactions.
A transaction recovery basically is going to isolate failure and also identify what is the cause of that corruption. So when a system restarts, transaction can fail to recover while the other transactions can be recovered. So with the transaction recovery, basically, we know when the system recovers, the SMON is going to use the redo and the undo.
02:27
Nikita: Can you explain that in a little more detail? How does transaction recovery work and why is it so critical for database stability?
Bill: It does the redo to roll forward the database. However, at that point, it'll go ahead and open the database, allow it to start being used while it is applying the undo. And when it cannot apply that undo, that's when the system is going to mark that transaction as bad for that.
That is what is transaction recovery. Whereas instance recovery is basically the same thing, except now you're in a RAC environment. And it's unable to be recovered on one of the instances within your RAC environment.
Because it can be, it'll have those rows locked, and it can affect the other instances. So SMON might be unable to perform that recovery, so it could cause that PDB or the CDB to crash. OK, now, nobody can access any information.
So once if that entire container crashes, recovery is going to stop. If it has a bad transaction, recovery stops. So it might be because of physical data, might be because of the index is corrupt, might be logical corruption.
So it stops that interactive transaction recovery process. So not only does it stop the recovery of the transaction that is trying to be recovered by SMON, it's going to stop the rest of the inactive transactions. Those row locks are held.
And it can impact critical operations. Yeah, if my system can't do anything, yes, it's going to have an impact. The DBAs must resolve what is that bad transaction, how to get rid of it, how we're going to get around it?
04:12
Lois: Bill, whatās the workflow a DBA would follow when a transaction is quarantined?
Bill: So in the system, when that transaction recovery failure is, OK, I've found this dead transaction.
I'm going to quarantine. I'm going to say, hey, you have something you need to take care of for that. So it's not recovered by the SMON. So what's going to happen?
So there is also is going to be a limit. So if it does reach that limit and the limit is three, then you're going to have to step in and try to take care of that very quickly.
The shut down abort will be performed on the PDB. So the good news there is that it's going to keep it from impacting the entire container. If the limit isn't reached, well, then, OK, hey, we have this bad transaction that's going to quarantine, is going to populate.
There's a couple of views that you can go out and look at. There's a CDB quarantine transactions or a DBA quarantine transactions. Those views you can look at. And then once we determine that, what are we going to do to try to recover it?
If we're going to try to recover it, then we can go ahead and drop that bad transaction. It'll help free up the rows. That way, everything can start working again. That PDB can be opened.
05:30
Nikita: What can you tell us about monitoring quarantined transactions? What specific views or logs should DBAs monitor?
Bill: So you can view.
You'll see these quarantine transactions in several different places. One is the alert queue. It's going to be sent to the alert queue. That is what is going to notify Enterprise Manager Cloud Control, also populates it within the AWR.
Back in 21c, we added the attention log. It shows critical events. Hey, you need to take a look at this. It also can populate it. It will populate it to the alert log.
So remember you have the V$DIAG_ALERT that you can look at. Or, if you're familiar with or you use the ADRCI, automatic diagnostic repair recovery advisor, so you can also look at the alert log there. So there are two new views, the CDB_QUARANTINED_TRANSACTION, the DBA_QUARANTINE_TRANSACTIONS working with multi-tenant. The CDB, I can see all the quarantine transactions from the root container, the DBA_QUARANTINE_TRANSACTIONS what I see if I'm in a specific PDB. But it's going to give me the information.
06:52
Lois: What about resolving quarantined transactions?
Bill: Monitoring is a must to be able to identify, hey, we have bad transactions that we need to-- quarantine transactions we need to take care of. You can apply the appropriate MOS note if you're not sure what to do. Like anything else, if something happens-- and hopefully, you're not getting quarantined transactions daily or anything like that. But once we start doing a few things, we remember how to do them.
07:21
Lois: And, how do we take care of this?
Bill: Well, you always have the ability to go to My Oracle Support. There is a view called-- that CDB quarantine transaction that we talked about that we can look at, hey, here's the reason. And we might use that to go out there and search My Oracle Support and/or contact Oracle Support.
07:49
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08:09
Nikita: Welcome back! Bill, what are some of the common causes of quarantined transactions? Could you share some examples with us? And how do you resolve them?
Bill: One could be physical corruptions. It could either be logical or physical. So maybe because media failed. Hardware bits get flipped. So that might be able to be easily fixed by using the RMAN Block Media Recovery. And that's the lowest level of recovery that we can apply.
And then there's logical corruptions. This is the recommended order when trying to resolve logical corruptions. First level is the Block Media Recovery. And then, after that, if the Block Media Recovery fails, then possibly, how about re-creating that data segment? So either truncate or drop it, and then recover it from another source. So once you drop the segment, the transaction then is going to skip trying to recover it. It's no longer there. So it's, OK, hey, I'm successful now.
And then, the last resort type method is to drop that undo segment. There's an offline rollback segment that you can use. But it's recommended-- it's best to avoid that-- again, kind of a last-ditch effort to try to fix something. There are other options that you might try. However, these options do end up being a loss of data. Why? Because we're going to do a point-in-time recovery.
So we can go back to a table point-in-time recovery. So we start with the Block Media Recovery. OK, we can't. OK, so how about if we go back before that transaction and try to recover the table at that time? So it will be a loss of data.
Then, the next level is, we can't do the table. Can we do the entire tablespace? That might be an option. Might flashback the database if we are using-- if we have Flashback Database on. Again, that's just another method of point-in-time recovery. And then also do a database point-in-time recovery.
If we can do the database point-in-time recovery flashback at the PDB level, so that way it's not impacting the entire container, hopefully, we don't have to try to do a point-in-time recovery at the database level. So we wouldn't want to do that. That would something really drastic would have to happen to force us to do the entire container. But we want to do that at the PDB level.
10:54
Lois: Ok. So the issue is resolved. What happens next?
Bill: So once we have the issue resolved that caused that, SMON is still going to try to do transaction recovery because why? That quarantined transaction says, hey, I've still got this bad transaction there. So once that transaction has been fixed, we need to drop that quarantined transaction. So that way, SMON says, hey, I have this transaction. I need to recover. SMON will keep from trying to do that.
So there is a DDL command to drop that quarantined transaction. So remember, from the views, the quarantined transaction views, that's where we saw the undo segment. We saw the slot number. We saw the quarantined transaction slot number. So that way, we can drop that transaction by using that.
11:51
Nikita: How does the escalation process work for quarantined transactions? And why is it important to protect the PDB and the container database?
Bill: So quarantined transaction escalation-- we might have multiple transactions fail, depending on the corruption level. It might have multiple blocks for that that have failed. So just to quarantine a bad transaction may not help whatsoever. It depends on what the root cause is for the failures and how many are happening at that time. So the database with these bad transactions will continuously run in an inconsistent state. So it could be dangerous if we have multiples of the same issue and that.
So with that system running in an inconsistent state, things will continue to spread. Things will continue to get worse. That's why, once that level of 3 is reached, we go ahead, and we do a shut down abort on that PDB. Because if a transaction can't be recovered, there's no need in trying to do any other type of shutdown.
So with this escalation process, it does benefit us because, again, SMON is going to continuously try to recover that bad transaction for that. OK, SMON's going to keep trying. It's not going to work. And at some point, it might cause it to crash. So by stopping it before it continues getting worse, damaging more, we're going to go ahead and say we're escalating this issue to where we're shutting down the PDB.
Fault tolerance, so meaning that we have higher availability of the rest of the container. So it's not going to crash the entire container. So the PDB can continue to operate when we are trying to resolve transactions except in the case where it exceeds the amount, and it does a shutdown abort on that PDB.
So with that escalation, we reach that limit of 3 for that. We do a Shutdown Abort on that PDB. That transaction recovery is disabled. OK. Don't try to recover any transactions. Why? Because we know we have a few of them. So it's shut down, so we're going to go out and look at our quarantine transactions views, what's the reason for that, how many do we have?
And then, once we resolve the issue, we are going to enable recovery again because it turns off the recovery option before it allows us to open that PDB. It's not going to be in a consistent state, though. So now we can go ahead and alter the system and, OK, go ahead and allow recovery of transactions again.
14:42
Lois: Thank you, Bill, for walking us through the details of automatic transaction quarantine and telling us how to manage and resolve these complex scenarios.
Nikita: Yeah, thanks Bill! To learn more about what we discussed today, visit mylearn.oracle.com and search for the Oracle Database 23ai New Features for Administrators course. Join us next week for a discussion on some more Oracle Database 23ai new features. Until then, this is Nikita Abrahamā¦
Lois: And Lois Houston signing off!
15:13
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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Join Lois Houston and Nikita Abraham as they discuss the Automatic Transaction Rollback feature with Senior Principal Database & MySQL Instructor, Bill Millar. Bill explains that in the 23ai release, transactions blocking other transactions can now be automatically rolled back, depending on certain parameters. Bill highlights the advantages of using automatic transaction rollback, which eliminates the time-consuming process of manually terminating blocking transactions. They also cover the workload reduction benefits for database administrators. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-new-features-for-administrators/140830/ Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. ------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26Lois: Hello and welcome back to the Oracle University Podcast. Iām Lois Houston, Director of Innovation Programs with Oracle University, and with me is Nikita Abraham, Team Lead of Editorial Services.
Nikita: Hi everyone! Last week, we looked at two Oracle Database 23ai new features related to Data Manipulation Language, or DML. One was Unrestricted Parallel DMLs and the other was Unrestricted Direct Loads. Do check out that episode if you missed it.
00:56
Lois: Today, we have Senior Principal Database & MySQL Instructor, Bill Millar, with us. Heās been on several times this season taking us through all the different 23ai new features. In this episode, weāre going to ask him about the Automatic Transaction Rollback feature. Hi Bill! What is automatic transaction rollback and why is it an important feature for database administrators?
01:22
Bill: We can now have transactions that are blocking other transactions, depending on some settings, to automatically roll back. It does require some parameters to be set. Rows basically get locked in a single row. Each row is locked based off of what type of activity is being performed on that row, such as inserts, updates, deletes, merge, select for updates.
01:52
Nikita: And how were things before this feature?
Bill: Traditionally, the database administrator had to research and manually terminate blocking transactions, or there are some things that resource manager might have been able to do.
02:05
Lois: This seems like such a game-changer for DBAs, Bill. So, how does it work?
Bill: So there are some parameters that control the automatic rollback. One is the transaction priority. We're going to set that priority for a transaction either to medium, high, or low. We have the high priority wait target and a medium priority wait target that we can set.
The high wait target will terminate if a medium transaction is blocking that high target based off of the values that we set, the medium transaction can be terminated. A medium transaction will terminate a low priority. So if a transaction designated as low exceeds the blocking time that we set for the medium priority wait time, then it'll be terminated. Whereas, the high priority will terminate both medium and low transactions.
We have the rollback mode. We're either going to roll back or we're going to track, depending on what we're trying to do.
03:10
Nikita: So, if I decide that I want to use automatic transaction rollbackā¦ if I decide to implement itā¦Iāll need to set those parameters, right?
Bill: So we can set those at a session level. We also have some system level wait targets. What are the wait times for the medium, high transactions? How long they are going to wait for those lower transactions?
And then we also have the rollback mode. Are we actually going to roll back or are we just going to track for right now? We have to determine what is going to be the wait times for those transactions that we want to wait before those lower transactions, priority transactions are rolled back?
At that session level, we're going to set the session. High is the default. So if we want transactions to run at a lower, we have to set those. So we can set the medium or low because that's going to determine how they're rolled back.
So, what is that rollback order? Again the low, we'll roll back any low that's blocking mediums. High, we'll roll back any mediums or lows that are blocking. So you do need to have the understanding of that application, and how critical are the different transactions, because if you start rolling back transactions, what? It does-- If you roll back the transactions, it does generate a little research, a little bit more work on why did that happen.
04:38
Lois: Yeahā¦ you don't want to set it without really understanding what youāre doing. Ok, so, what else do I need to know?
Bill: So we do have the system level wait targets again. How long is the high priority transaction going to wait for a lower transaction before it rolls it back? How long that medium priority is going to wait?
We use the ALTER SYSTEM SET command. It does have a range of values from one second to 2,147,483,647 seconds. That's like 68 years. Might not want to wait 68 years for a transaction to be rolled back.
We can set it at the PDB level. Each pluggable can have a different value. And it can have a different value in the different RAC instances. We have those system level wait targets that we want to set. Automatic rollback. In order for it to function, all the parameters have to be set properly.
What is that transaction priority? We saw the medium, high, low. What is the wait target? How long is the medium is going to wait? How long is the low is going to wait? We set that in seconds. The order of those transactions determine how they are terminated.
05:53
Lois: Earlier on, you mentioned rollback mode. Can you tell us a little more about it?
Bill: So with that automatic rollback mode, there's only two valid values. It is considered advanced parameter. We can either set it in rollback, which is the default, or we can put it in track mode. Track mode gives us the ability to try it out. I guess you can say.
It will say, hey, if I would have been running, if I would have been used, I would have terminated this transaction. It'll show me the number of times it would have happened for high priority, the number of times it would happen for a medium priority. It is modifiable in the PDB, but however, the track mode must be the same in each instance.
So that rollback mode, again, that is the default value for that. So statistics are going to be available. So how many high priority rollbacks occurred? How many medium rollbacks occurred?
In that track mode, I have to set that value. I do have to have the time set for how long is it going to wait for those, so the high and medium. And those priorities has to be set in the session.
So statistics are available for the high and the medium in the track mode. Not only when we're actually rolling back, but also tracking. Again, this gives us the ability, by having it in the track mode, gives us the ability to do a little testing with it first.
07:27
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07:55
Nikita: Welcome back! Bill, when it comes to monitoring, how do you keep track of these rollbacks?
Bill: For monitoring our rollback transactions, the data dictionary information is available to assist with monitoring our transaction priority. So from the V$TRANSACTIONS, there are columns available allowing us to do that.
Based off that transaction priority shows what is the wait target for that. And then also each of the priority of those transactions. We can view this information, it will be populated to the alert log. So we can see that session ID, what was session ID of that? What was the transaction ID? What was the priority? What was the system identifier for that?
It tells you-- even tells you the parameter and tells you what that wait time was set at. If it was a medium transaction that was terminated, it shows, OK, it was a medium. So we can view the alert log. And we can look for these terminations. Gives an idea of what's being done.
09:01
Nikita: And finally, what are the key advantages of using automatic transaction rollback?
Bill: It eliminates a very manual process. It can be very time-consuming for the DBA to go out there and try to find what's the blocking session.
Yep, I'll go ahead and do an ALTER SYSTEM. I'll kill that session trying to track it down, finding the views to look at it to say, OK, Yeah, this is the blocking one. I want to go ahead and take care of it. Resource manager doesn't really fully address blocking transactions.
Some things that can do for that. We have the maximum estimate execution time. So that's the number in CPU seconds allowed for that call. It's terminated. It doesn't matter whether it's blocking another session or not in that case or even another transaction. It just says, OK, you exceeded this time. I'm going to terminate you.
Then we also have the max idle time again. That's maximum session idle time. All right. You haven't been doing anything to session, we're going to terminate you. And then we have the MAX_IDLE_BLOCKER. That's the time duration of an idle session can block another session. Again, it's going to check OK, is the session actually idle? But these don't really address the issue of, hey, I have a higher priority transaction waiting for a lower transaction that's blocking it.
10:27
Lois: Thank you, Bill, for that breakdown. This feature is such a time saver.
Nikita: Yeah, and such good way to reduce the manual workload for DBAs. Thanks Bill!
Lois: To learn more about what we discussed today and view some of the demonstrations of this feature, visit mylearn.oracle.com and search for the Oracle Database 23ai New Features for Administrators course. Join us next week for a discussion on some more Oracle Database 23ai new features. Until then, this is Lois Houstonā¦
Nikita: And Nikita Abraham signing off!
11:02
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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In this episode, hosts Lois Houston and Nikita Abraham discuss new features in Oracle Database 23ai related to Data Manipulation Language (DML). They are joined by Senior Principal Database & MySQL Instructor, Bill Millar, who explains the concept of unrestricted parallel DMLs and their importance in speeding up large operations and maintaining summary tables. The discussion then turns to unrestricted direct loads, examining the evolution of direct loads with 23ai and the broader impact of these changes. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-new-features-for-administrators/140830/ Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26
Nikita: Welcome to the Oracle University Podcast! Iām Nikita Abraham, Principal Technical Editor with Oracle University, and with me is Lois Houston, Director of Innovation Programs.
Lois: Hi there! In our last episode, we discussed a ground-breaking caching solution in Oracle Database 23ai, known as True Cache. We spoke about its configuration and deployment, and explored how to apply True Cache to our applications.
Nikita: Today, weāre going to talk about two Oracle Database 23ai new features related to Data Manipulation Language, or DML. The first is Unrestricted Parallel DMLs and then weāll move on to Unrestricted Direct Loads. Weāll talk about the situation prior to 23ai, identify the improvements that have been made, and look at their benefits.
01:15
Lois: And returning for another episode is Bill Millar, our Senior Principal Database & MySQL Instructor with Oracle University. Hi Bill! So, to start, can you explain what unrestricted parallel DMLs are and why they are important, especially in the context of Oracle Database?
Bill: The Oracle Database allows DML statements such as inserts, updates, deletes, merge to be executed in parallel by breaking those statements into smaller task. These transactions can contain multiple DML statements. And they can modify multiple different tables.
So transactions with the parallel DML is going to use the execution method by breaking up those large operations to execute the transaction in parallel. It helps speed up the large operations. And it's advantageous to data warehouse environments where we're maintaining like summary tables, historical tables. And even in OLTP systems, it can be beneficial for long-running batch jobs.
The scale up. Well, it's basically dividing the executing SQL against those large tables and indexes into those smaller units of work.
02:36
Nikita: So, what were the limitations prior to 23ai?
Bill: So once that object was modified by APLL statement, the object cannot be read or modified later in the same transaction. After that parallel DML modifies a table, there is no follow-on DML or query on the same table within that same transaction. If any attempt to access a table modified by that parallel statement, the transaction would be rejected.
You're only allowed to query on those tables prior to that DML on that object itself.
03:16
Lois: Okā¦ So with these new improvements, Iām guessing some of these restrictions have been removed?
Bill: In this case, in the same session, you can query the table multiple times. You can perform conventional DML on the same table within the same session. And you can also have multiple direct loads in the same session without having to do that commit.
But there are still some restrictions with it. Heap tables only. You can't do it with any clustered tables or IOT, Index Organized Tables. Non-ASSM, the Automatic Segment Space Management tables. The temp table is not under ASSM. Why? Because it has to have uniform extents or any other tablespaces that you created with the uniform extents. So those restrictions still apply.
So some of the improvements are some of the restrictions can help reduce the overhead. We can enable Parallel DML within that session. Allows the multiple operations on the same object. And it doesn't require that commit for each separate operation.
Makes it a little bit easier to use by removing some of these limitations. Now users can run parallel DMLs and any combination of statements within that same transaction. And it can help simplify and speed up data loading analytic processes by making the database, the parallel execution and parallel queries, at the same time within that same session, again, eliminating having to do commits.
04:58
Nikita: Thanks for that summary of all the improvements, Bill. Now, how do you enable this? Is it enabled by default?
Bill: To enable the Parallel DML mode, it is required for a session. It is disabled by default. That's because the Parallel DML and Serial DML, they have different locking, different ways to handle the transactions, different disk space requirements.
When Parallel DML is enabled in a session, all DML statements are considered for parallel execution. Only a statement is considered for parallel execution when the Enable Parallel DML hint is used if I don't set it for a session. The sessions DML mode does not influence any parallelism of DDL statements. When the Parallel DML is disabled, no DML is executed in parallel, even if the hint is used.
05:59
Lois: Bill, I would like to dig a little deeper into the benefits. How do these lifted restrictions improve the overall performance and reduce overhead?
Bill: There's no longer that requirement to commit everything separately. So that's going to reduce the overhead, not having to do the commit all the time.
The scalability of accessing those large objects, executing parallel makes the decision support systems, those data warehouses and batch OLTP jobs or any other larger DML operation execute faster.
By removing that one touch limitation, it allows the parallel DML statements to be read or modified by later statements of the same transaction in the same session. It's very similar to the non-parallel statements. And even OLTP systems can also benefit, for example, maintaining a larger operation, such as the creation of indexes, refreshing tables, or even creating summary tables.
07:14
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07:42
Nikita: Welcome back! Let's move on to the next new feature, which is unrestricted direct loads. Bill, what was the situation with direct loads like, prior to 23ai?
Bill: After a direct load and prior-- it was always prior to a commit, queries in additional DMLs were not allowed on that same table. You might encounter the ORA error, the 12838, saying, hey, you can't read or modify this in parallel. That's because the DML on that direct load had access to that and that session for that. So you might have received that error.
The enq contention, the wait event for the direct load issue in a different session from the other sessions during the direct load is having to wait, because of that queuing that-- because a transaction gets that table, locks that information to keep that table from being modified until that direct load has actually committed.
Within the same transaction, within the same session, trying to do multiple DMLs with the-- while it is being modified with the direct loads itself. Unlike conventional loads, the direct loads, as the new blocks and extents are added to the segment, the high water mark does not actually get moved until the actual commit itself. So that's why there is restrictions in the same session or even in other sessions to be able to do anything. So to prevent the errors, the applications had to do a commit immediately after that direct load to prevent those errors from happening.
Well now, there are restrictions when that direct load was done prior to that commit for that. The same table in the same session, couldn't query, couldn't do any additional DMLs, couldn't do any additional parallel DMLs. And even in other sessions, queries were not allowed on the same tables that was in use by the other session. So no additional conventional DMLs, no additional parallel DMLs were allowed.
10:09
Lois: Ok.. it was restrictive in what could be done. So, how have direct loads evolved with the 23ai release?
Bill: Some of those previous restrictions have been lifted in that same session with that same table. So now you can immediately-- and notice that we're talking here, same session, same table. All right. So you can query multiple times within that same session. You can perform additional DML and you can also do multiple direct loads in the same session without having to do that commit.
However, there still are restrictions. It has to be a heap table. It does not work with index organized tables or clustered tables. And the tablespace, if it's not using the automatic segment space management, it cannot-- it does not apply to those either, or if tables with a uniform extents-- tablespace with uniform extents. That's why anything in the temporary table is also included. Why? Because the temporary tablespace has to be uniform extents.
11:17
Nikita: So, what are the restrictions lifted for different sessions on the same table?
Bill: Sessions can query that table, can perform conventional DML on that, able to also concurrently perform a direct load, and I can roll back to a save point. So you can see those added features can be very beneficial.
But there's still restrictions that apply. It still applies to heap tables only, and it still applies to only tablespaces that are using the automatic segment space management for that. Of course, that includes the temporary tablespace and it doesn't work with tablespaces that have uniform extents.
Your application DML might need to query the data after that direct load without committing, applications that might need to modify data within that same transaction as that direct load. You can enable multiple append hint. So you can specify the hint in addition to pending hint to disable. You can specify the no multi-append hint to disable it.
12:27
Lois: Bill, whatās the broader impact of these changes. How do these improvements make things more development-friendly?
Bill: So changes to the direct load make things a little bit more development friendly by removing those directions after that direct load itself. So previous restrictions when loading-- querying the data kept us from doing multiple things at the same time. So now I can query on that table direct load from the same session, from a different session. I can do conventional DMLs on the table within the same session. It allows me to do a rollback on it.
I can do direct loads on the same table within the same session. Again, I can also allow rollback to a save point. As long as my compatibility is set to 21.0.0.0, I will be able to go ahead and benefit from this feature. And there is no increase with it as far as the space usage or causing any fragmentation to the table. So that will not be an issue.
13:35
Nikita: Well, thatās the end of our time together, but I want to thank you, Bill, for sharing your expertise with us.
Lois: To learn more about what we discussed today, visit mylearn.oracle.com and search for the Oracle Database 23ai New Features for Administrators course. Join us next week for a discussion on some more Oracle Database 23ai new features. Until then, this is Lois Houstonā¦
Nikita: And Nikita Abraham signing off!
14:03
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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Hosts Lois Houston and Nikita Abraham are joined by Senior Principal Database & MySQL Instructor Bill Millar who explains Oracle's newest caching solution called True Cache. Available in Oracle Database 23ai, True Cache is an automatically managed, in-memory, read-only cache that improves application performance dramatically. Bill provides an overview of its features and highlights the benefits of using True Cache. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-new-features-for-administrators/140830/ Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26
Lois: Hello and welcome to the Oracle University Podcast. Iām Lois Houston, Director of Innovation Programs with Oracle University, and with me is Nikita Abraham, Principal Technical Editor.
Nikita: Hi everyone! Last week, we had quite a power-packed episode. We discussed the 23ai new feature for Automatic SQL Plan Management. We also looked at the 23ai automatic feature that enhances SecureFiles LOB Write Performance as well as the update to Wide Columns.
00:59
Lois: Yeah, and in todayās episode, we will look at True Cache, another 23ai new feature. To tell us all about it, we have Bill Millar back with us. Bill is a Senior Principal Database & MySQL Instructor with Oracle University. We'll ask Bill to give us an overview of True Cache, talk about its configuration and deployment, and discuss how to apply True Cache to our applications.
Nikita: To kick things off, Bill, can you give us a high-level overview of what True Cache is? How does it differ from other caching solutions like Redis or Memcached?
01:35
Bill: True Cache is an in-memory cache. It is read-only. True Cache is deployed in front of a primary database, and it is automatically managed. It keeps the most frequently accessed data in the cache, and it keeps the cache consistent with the primary database. They call it diskless, but it's not. It does require some space for SP file, redo logs, control files, and such. But it's very similar to Active Data Guard.
The queries can be offloaded to the True Cache for faster query response. And the data in the query cache is consistent. Unlike other mid-tier caches like Redis or Memcached, a query to the True Cache returns only committed data, and the data is always consistent. It's secure. Why? Because we implement our Oracle database security policies and you can control access to the cache.
02:33
Lois: So, why should we use True Cache?
Bill: Improve application performance without having to rewrite any applications. That can save considerable amount of time, effort, and expense. Reduces the application response time. So the closer the True Cache is to the application, the faster the response. Now, you do need a large amount of memory. We're talking memory here. It's an in-memory storage area, and depending on how you configure it, you can have it shared, you can have it divided. We mentioned it's automatically maintained. So there's no application changes required, and it is transparent to the application. Again, simplifies that development and maintenance.
03:15
Nikita: How does it impact application performance, and what kind of scenarios would benefit the most from implementing True Cache?
Bill: So at a high-level view, True Cache or primary database, the application configuration serves as other things that are going to decide where is it going to query the data from, from the True Cache or from the primary database.
The True Cache satisfies that query. And that's where the data will be fetched from. If not, then from the primary database. On start up, True Cache is empty. So it starts reading large chunks of data to populate the True Cache. So after a block is cached, then again, it can be automatically updated, apply the redo to it-- very similar to the Oracle Active Data Guard. In the data returned, it is always going to be consistent.
04:04
Lois: Is it going to be current data?
Bill: Maybe, maybe not. If it's been updated in the primary, if they redo apply hasn't occurred yet, then it's not the most consistent. But as far as the query cache is concerned, it is the most current because we only display consistent. You can have multiple True Caches. You can save the same database application service to the True Cache as you can partition it.
04:28
Nikita: I'm curious about the memory requirements, Bill. How crucial is memory for True Cache's performance?
Bill: You need to have significant amount of memory. Memory, memory, memory. So True Cache is completely memory, memory. So I want to have all my data possible in there. The more memory you have, the less likely something is going to age out. And of course, just like with the standard caching, you can also pin objects to stay in the True Cache.
Yeah, like I said, there are some requirements for storage, even though it's called diskless because of, again, redo log files, configuration files like the control files, SP file. And again it is read only.
05:11
Lois: Can you explain the differences between using physical and logical connections with True Cache? How does this impact the way applications interact with the database?
Bill: So with using the True Cache, we have two physical connections, and we can have one to the primary database and one to the True Cache. Each connection has a database application service associated with it, and it's going to choose which connection to use based whether it's going to go to the True Cache or to the primary database.
The second way is the application maintains one logical connection that uses the application service for the primary database. It's the JDBC thin driver, starting with Oracle Database 23 is available. It's going to maintain the physical connections to the primary database and the True Cache itself. Now, the logical connection, the one logical and one physical, is for Java applications only.
Applications that work with JSON, we extend the HTTP entity tag support for that. So a database GET request to the True Cache is going to compute the ETag, insert it into the return document.
06:27
Nikita: But what happens if thereās a mismatch when the modified document is put back into the primary database?
Bill: Well, then the database is going to verify. OK, what happens with that?
It's going to verify the document row still matches that ETag for that. If with that put command, let's say, I have new data here, the row is going to match that ETag that was automatically updated. If there's no match, another user has changed the data and the PUT request is rejected. So the PUT request can be retired using the new data.
07:05
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07:48
Nikita: Welcome back! Now, how do you configure True Cache, Bill?
Bill: You can configure True Cache one of two ways. You can either use the Database Configuration Assistant, which actually makes it a little simpler to configure it, and you can also manually create it.
You have some environment options. One is a uniform configuration where you can deploy identical True Cache that use the same database application service. Another way is partition configuration. The data is going to be divided across multiple True Caches, which, each cache is a different subset of the data. You can also deploy True Cache in a RAC environment. As one might expect, there are some additional configuration steps for a RAC environment.
You want to make sure you verify your configuration, that the database application services are working as expected after you configure it. And then, optionally, you can enable DML redirection. What that will do, it writes data to the primary database, and that data is automatically updated in the cache. It's very similar how to the Oracle Active Data Guard works. Because the DML redirection uses more resources, it's not recommended for update-intensive applications.
There is a parameter, a ADG_REDIRECT_DML initialization parameter, that you will set to True in order to do that.
09:18
Lois: Bill, what are the specific challenges or considerations that administrators should be aware of during the configuration process?
Bill: You do need to make sure your network is configured for True Cache in the primary database. So optionally, you can create a remote listener for high availability. But you create your True Cache. You go ahead, and make sure that you have your primary database. You want the network configuration for both of those. And then you create the True Cache. Once the True Cache is created, you're going to create the application services associated with the database. And then, you're going to start the database application services on the True Cache.
When it comes to naming the application service names, each primary database application is going to be associated with a corresponding True Cache application service. To help simplify things a little bit, in the naming convention, you'll notice in our examples-- for example, if we have SALES as the primary database service, then we have the True Cache, we have SALES_TC, standing for True Cache, so it's easily identified.
You don't have to do that, but it's kind of recommended to do that, some way that you're going to identify it. So we're going to start our True Cache services. And you only start the True Cache services on the True Cache instances. Because it's the database services on the database that you need to make sure are started. And they are read-only.10:46
Lois: Are there some best practices for maximum availability architecture?
Bill: Uniform configuration seems to be a popular one. Why? Because I am going to have the both True Caches can be shared. That way, hopefully, I'm getting full usage out of both. And maybe if I have one service going to one, it might be minimally used. Whereas, the other one might be over. Hey, I could use more memory over here.
We'll also recommend use the JDBC 23ai UCP, Universal Connection Pool, for the application. So that can lessen the impact. If one True Cache becomes unavailable, as far as, OK, I need to reroute over here-- benefit of uniform configuration also. Prepopulate the cache. You want to go ahead and run the critical workload for that. If you have a planned outage, and you need to shut down the True Cache, you want to make sure you stop the database application service on that True Cache.
And then, how are you going to design your True Cache? Are you going to partition it? Are you going to have uniform? Which partition option are you going to use? So you can try to design that to help minimize the number of fetches it has to do from the primary database. And the more you can keep in the True Cache, the better the performance is going to be.
12:09
Nikita: What do I need to keep in mind when it comes to managing True Cache?
Bill: One thing you might need to do for managing the True Cache is to monitor the True Cache. There's a couple different ways that we can do it. One, you can use the V$ view, the V$TRUE_CACHE view. And, of course, you can always use the Automatic Workload Repository.
12:30
Lois: Bill, we already spoke about this a bit, but can you tell us more about using True Cache in an application?
Bill: There's two ways of using True Cache, as we've seen, physical and logical. Physical, it's going to maintain two connections, front one to the primary database and one to the True Cache. The application can decide which connection to use, based off of what it is trying to do.
If it's just reading, long as it's for a service that's configured with True Cache, it can read the True Cache. If it's going to write something, it's going to update, insert, whatever the case might be, it's for the primary database. And you can use any existing client driver as long as you're using the physical connection method. Any programming language will also work.
With the one logical connection method, it uses the application service for the primary database. You're going to use the JDBC Thin driver, starting with 23ai. You can use it and it maintains the connection to the primary database and True Cache. This model only works with Java applications, though. It maintains the physical connections.
We're going to enable the driver connection. And then, we're going to set the read only. We're going to set it to read only, true. Read only, false, whatever the case might be. And the read only mode is false for a connection by default. False is the default. Java applications only.
14:14
Nikita: What are some best practices for load balancing in a uniform configuration?
Bill: You have multiple--multiple True Caches. They're going to service the same database application. They're going to cache the same data. It's the listener that's going to distribute the load balances. So the listener will automatically distribute and load each session to each cache. It will do it randomly and it will do it based off a load. Where can it configure? Where can it send for the best performance.
To route the request to the best performing True Cache, you want to make sure that you are using the same listener. So that remote listener parameter should point to the same listener, which is also the primary database listener. Single instance primary database local listener or scan listener, whichever one you're using, points to the primary. For the application for the JDBC URL, should point to the primary database.
You'll remember that Thin driver is going to create that logical connection, and it's going to create the physical connection to the primary database into each True Cache. To simplify things and possibly avoid connection issues, you might consider using the LISTENER_NETWORK, so the initialization parameter instead of specifying the remote and local listener separately. Because with the local--with the listener networks, all listeners within the same network name will cross register.
15:44
Lois: Before we wrap up, are there any complementary features that you would recommend using alongside True Cache to further enhance performance or simplify management?
Bill: There are features that can complement True Cache-- the server-side result set cache.
So you can create--you can go ahead and create the result set that's part of the library cache set aside, a portion of that. You're going to go in, you're going to configure what objects will use that. You can still use that even with True Cache.
There's also the KEEP Buffer Pool that can be used. It's a separate pool that you set aside as part of the buffer cache. And you want to make sure you size it so the object that you want to keep in memory in the buffer cache that you size it appropriately. But again, some configuration, you configure the key pool, plus also you go in and alter the objects to use it.
And then lastly, there's the database smart flash cache. So again, if your data doesn't fit into memory, you can expand the capacity of by adding flash devices. When you configure the flash cache, if you are using transparent data encryption data, the local flash devices is not supported. So if it's TD encrypted on the primary database, it's going to stay in the buffer cache of the primary database.17:11
Nikita: Ok! I think we can close the episode with that. Thank you, once again, for joining us, Bill.
Lois: Yes thanks! Weāre learning so much from you. To learn more about what we discussed today, including the various configuration options that are available, visit mylearn.oracle.com and search for the Oracle Database 23ai New Features for Administrators course. Join us next week for a discussion on some more Oracle Database 23ai new features. Until then, this is Lois Houstonā¦
Nikita: And Nikita Abraham signing off!
17:46
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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Join Lois Houston and Nikita Abraham, along with Senior Principal Database & Security Instructor Ron Soltani, as they discuss how the new Automatic SQL Plan Management feature in Oracle Database 23ai improves performance consistency and simplifies management. Then, Senior Principal Database & MySQL Instructor Bill Millar shares insights into two new features: one that enhances SecureFiles LOB Write Performance, improving read and write speeds, and another that increases the column limit in a table to 4,096, making it easier to handle complex data. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-new-features-for-administrators/137192/207062 Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26
Nikita: Welcome to the Oracle University Podcast! Iām Nikita Abraham, Principal Technical Editor with Oracle University, and joining me is Lois Houston, Director of Innovation Programs.
Lois: Hi there! Last week, we looked at the Oracle Database 23ai enhancements that have been made to Hybrid Columnar Compression and Fast Ingest. In todayās episode, weāll talk about the 23ai new feature for Automatic SQL Plan Management with Ron Soltani, a Senior Principal Database & Security Instructor with Oracle University.
01:01
Nikita: And later on, weāll be joined by Bill Millar, another Senior Principal Database & MySQL Instructor, who will tell us about the 23ai automatic feature that enhances SecureFiles LOB Write Performance. Weāll also get him to talk about the Wide Columns update. So, letās get started. Hi Ron! What have been the common challenges with SQL plans and database performance?
Ron: One of the problems that we have always had, if you remember, was when data changes, database setting configuration, parameter changes, SQL that were operating very well could now behave badly using the SQL plan that were associated to them. And remember, the same SQL plan generally Oracle likes to continuously reuse.
So the SQL plans were put in the baseline in the past, and we could have those SQL plan baseline, which are a set of approved plans to be used for a SQL from the SQL history stored in AWR, then could be used for the optimizer to choose from. However, which plan to choose and which one would be the best one to use, this is what the problem has been in managing the SQL plan baselines, and a lot of the operation would have been done manually.
02:22
Lois: And what have we done to overcome this?
Ron: So now this new system will going to perform all of those operations automatically for us. Now it can search the Automatic Workload Repository. It can find SQL plans for a particular SQL statement, then look for any alternative plans that may available in alternate sources like SQL tuning sets. And then validate those plans and see if those plans are going to be good and to be used as SQL plan baseline for executing SQL statement by the optimizer.
03:00
Nikita: So we now have the Automatic SQL Plan Management Evolve Advisor to help manage operations automatically, right? Can you tell us a little more about it? How does it ensure optimal performance?
Ron: This is an automatic advisor that is created that can go look for different plans and validate the plans by examining them, making sure that they are not causing any regression compared to the previous operation, and then evolve that plan into a good baseline.
This simplifies management of the baseline repository for a SQL statement. So as data changes, as parameters changes, optimizer could come up with different type of plans that are set within this baseline that has been validated to be good baseline for each situational operation. So this way you reduce a lot of hard parsing operations.
04:00
Lois: And how does the SQL Evolve Advisor work, Ron?
Ron: First, it will check the AWR to find what are the top SQLs that has been found. Then it will look to see if these top SQLs who did not perform well with the plan that they have, that's why they're top SQL, have other alternative plans that are stored in the SQL plan history, in AWR, or available in any other sources.
Then if it finds any additional plans, it will go ahead and add all of those plans into the plan history. So in the plan history, now you have accumulation of all the plans available in AWR and anything that has been brought from other sources. Then it will test every one of those plans and validate that by use of the plan, the SQL statement will not deprivate and get slower. The performance is either similar or actually better. So normally, there is a percentage that the SQL should improve. So we will then validate these baselines.
And finally, once the baselines or those plans have been validated, they will be accepted, and then they will be added as SQL plan baselines. They will remain in the statement history, in the AWR, and will be available for optimizer for the future use.
05:28
Nikita: What are the benefits of this?
Ron: Number one is Autonomous Database. As you know, they want to automate all management, including management of the SQL execution due to changes that are happening for the application, for the data, or the database and its environment.
It totally eliminates any manual intervention for management of the statement, and it can transparently repair any statement that had been affected by a major change.06:00
Lois: What sort of problems does this feature solve for us?
Ron: Of course, this is a performance consistency. We want to make sure that every statement performed to its best performance and any specific changes that may impact those SQL statements would be taken into an account, and a better plan, if available, would then be available for use.
It also improves the application performance level, therefore database service level will get much improvement. And the SQL execution plans will be automatically managed behind the scene by expanding these baselines, by managing all of these baseline history and all of that that is managed by this automatic SQL plan management environment automatically.
06:50
Nikita: And when do we use this?
Ron: If there is a change in a database environment, like you add SGA, the change into the shared pool, change in the size of the buffer cache or any type of storage effects. So all of those can actually affect the SQL execution.
Now all of those changes, including data changes, can cause a SQL plan to not behave very well or behave as well as it was doing before. Therefore, if particular plans do not perform as well as they did before, that affects the performance of the application. This also affects the performance of the database and the instance.
07:35
Lois: So, how do we use this environment?
Ron: Well, best news that I have for you in that is that there is nothing manual needs to be done. All we need to do is, number one, make sure that we enable foreground automatic SQL plan management that we done through the package for the DBMS SPM for SQL plan management.
You will use the package with the configure option, and you enable the auto SPM evolve task, and you set it to auto. Once this is done, now the SQL evolve plan management and advisor are enabled, and they will then monitor your statements, review all of the top SQLs as they are found with all of the ADDM operation, and then do their work in looking for better plans and being able to maintain the SQL plan baselines we talked about.
Now for you to be able to view, monitor, and see how these operations are going, if it is enabled, you can take a look at the DBA SQL plan baseline's view. There are many, many columns in that particular baseline, and there are also columns that has been added that tell you where is the plan generated from, if a plan is approved, and any other user interaction with the plan or settings can then be verified using that DBA SQL plan baseline view.09:13
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09:54
Nikita: Welcome back! Letās bring Bill into the conversation. Hi
Bill! Can you tell us about the 23ai automatic feature that enhances SecureFiles LOB Write Performance?
Bill: The key here is that it is automatic and transparent. There's no parameters set. Nothing to configure in table, no hints, and nothing that you have to do with these improvements. It is tightly integrated with SecureFiles LOB infrastructure.
So now, multiple LOBs can be handled in a single transaction and can be buffered simultaneously. This will help with mixed workloads, switching between the LOBs that are writing in a single transaction. The PGA will adaptively resize based off the size for these large writes for the LOBs if you're using the No Cache option. Remember, no cache is going to bypass the buffer cache and does direct reads and writes from the PGA.
JSON type will be transformed into the OSON Oracle data type. It is an optimized native binary storage format for JSON data.11:15
Lois: Ok. So, going forward, there will be better read and write performance for LOBs.
Bill: Multiple LOBs in a single transaction can be buffered simultaneously, improving mixed workloads. We just talked about the PGA. Automatically, the buffer is automatically resized.
And the improved JSON support. The reason it will recognize, hey, this is a JSON data type. But traditionally, JSON data types were small.
So they were small to medium size. So the range from 32k to 32 meg was considered small to medium whereas LOBs were designed for data types larger than 100 meg. So by recognizing this a JSON data type, it can take advantage of the LOB architecture.
Other enhancements will also include the acceleration of compressed LOBs, the pen and compression caching, and improves the poor performance of your reads and writes to compressed LOBs. It's faster than previously.
12:24
Nikita: Bill, what do you think about the recent increase in the column limit? Previously, the limit was 1000 columns per table, which sometimes posed issues when migrating from other systems that allowed more than 1,000 columns, right?
Bill: Maybe because of workload requirements, the whole machine learning, the internet of things workloads, IOTs can have hundreds of thousands of attributes, dimensional attribute columns for that. And even our very own blockchain tables reserves up to 40 hidden virtual columns, so that takes away from the total amount.
Virtual columns count towards the column limits and some applications as they drop columns, what it does, it just converts them to unused, and it still applies towards the limit the number of columns that you can have to that limit. There were workarounds. However, they were most likely not the best way to do it, like column switching, table splitting for that. But big data really use cases, really saw where files have or required more than 1,000 columns.
13:42
Lois: So, now that we can have 4,096 columns in a table, Iām sure itās made handling complex data a lot easier.
Bill: So by increasing this, since other systems do support higher column limits, it can-- the increase can make migration from other systems easier and possibly even a little bit more attractive while it can make applications a little bit simpler because the 1,000 column limit was not always optimal for analytics. Where 1,000 might have been plenty for OLTP type environments, but not for the analytics, especially when it comes to machine learning and those internet of things that we talked about, where the previous workarounds, like splitting the tables, really caused more performance issue than anything else.
So we want to avoid those suboptimal workarounds. And the nice thing is there's no change to the SQL. So once you have that-- well, if we were doing SQL, if we had tables that were split and we're trying to do things that is actually going to help improve that SQL, now, we don't have multiple objects that we're dealing with.
14:57
Nikita: How do we actually go about increasing the column limit to 4,096?
Bill: You do have to have the compatibility set to 23c. Why? Because it's a new feature. There is a new initialization parameter called Max columns, and you do set that. There's two different ways, two different values. We can set it to standard or we can set it to extended.
It is dynamic. When it's set to standard, it's only 1,000. When we set it to extended, it's going to allow the 4,096. It is modifiable at the PDB level. However, it will inherit what's at the root level, if it's not explicitly set at a PDB. It can't alter it in a session for that. And multiple instances of the RAC environment must use the same value.
Now one thing, notice that it cannot be set to standard if I created a table that had more than 1,000 columns. One thing that might get you, when you drop a table that has more 1,000 columns and you try to set it back to standard, it might tell you, hey, you have tables that have more than 1,000 columns. Don't forget your recycle bin unless you did a drop table purge.
16:09
Lois: Are there any performance considerations to keep in mind, Bill?
Bill: There's really no DML or query performance degradation for the tables. However, it might require, as you would expect, the increase in memory when we have the new column limits. It might require additional shared pool, additional SGA with the additional columns, more buffer cache as we're bringing blocks in.
So that's shared pool along with the PGA. And also we can add in buffer cache in there, because that increased column count is going to be increase in the total PGA memory usage. And those are kind of expected for that. But the big advantage is it gives us the ability to eliminate some of these suboptimal workarounds that we had in the past.
17:02
Nikita: Ok! We covered a lot today so thank you Bill and Ron.
Lois: To learn more about what we discussed today, visit mylearn.oracle.com and search for the Oracle Database 23ai New Features for Administrators course. Join us next week for a discussion on some more Oracle Database 23ai new features. Until then, this is Lois Houstonā¦
Nikita: And Nikita Abraham signing off!
17:27
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
-
In this episode, hosts Lois Houston and Nikita Abraham speak with Senior Principal Database & MySQL Instructor Bill Millar about the enhanced performance of Hybrid Columnar Compression, the different compression levels, and how to achieve the best compression for your tables. Then, they delve into Fast Ingest, whatās new in Oracle Database 23ai, and the benefits of these improvements. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-new-features-for-administrators/137192/207062 Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26
Lois: Hello and welcome to the Oracle University Podcast. Iām Lois Houston, Director of Innovation Programs with Oracle University, and with me is Nikita Abraham, Principal Technical Editor.
Nikita: Hi everyone! In our last episode, we spoke about the 23ai improvements in time and data handling and data storage with Senior Principal Instructor Serge Moiseev. Today, weāre going to discuss the enhancements that have been made to the performance of Hybrid Columnar Compression. We'll look at how Hybrid Columnar Compression was prior to 23ai, learn about the changes that have been made, talk about how to use this compression in 23ai, and look at some performance factors. After that, weāll move on to Fast Ingest, the improvements in 23ai, and how it is managed.
01:15
Lois: Yeah, this is a packed episode and to take us through all this, we have Bill Millar back on the podcast. Bill is a Senior Principal Database & MySQL Instructor with Oracle University. Hi Bill! Thanks for joining us. So, letās start with how Hybrid Columnar Compression was prior to 23ai. What can you tell us about it?Bill: We support all kinds of platforms from the Database Enterprise Edition on up to the high engineered systems for that and even the Exadata Cloud at the Customer. We have four different levels of compression. One is considered the warehouse compression where we do a COLUMN STORE COMPRESS FOR QUERY LOW and COLUMN STORE COMPRESS FOR QUERY HIGH. The COLUMN STORE COMPRESS FOR QUERY HIGH is the default, unless another compression level is specified. With the archive compression, we have the COLUMN STORE COMPRESSED FOR ARCHIVE LOW and also COLUMN STORE COMPRESS FOR ARCHIVE HIGH.
With the Hybrid Columnar Compression warehouse and archive, the array inserts are compressed immediately. But, however, some conditions have to be met. It has to be a locally-- to use these, it has to be a locally managed tablespace, the automatic segment space management. And compatibility level, at least 12 too or higher when these values have been introduced. There are different compressors that are used for the compression hidden from the customer. It just depends on what is selected as to what is going to be the compression that's going to be used for-- notice that with the COLUMN STORE FOR QUERY HIGH and for ARCHIVE LOW, the zlib compression method is used, whereas if you select the ARCHIVE HIGH, the Bzip2. And in 19C, we added the Zstandard. And it's available for the MEMORY COMPRESS FOR CAPACITY HIGH.
03:30
Nikita: So, whatās happened in 23ai?Bill: When in 23c, to take advantage of the changes in compression, the compatibility level has to be set at least to 23.0.0 or higher.
When a table is created or altered with the hybrid column compression, the Zstandard will automatically be selected. So it doesn't matter which one of the four you select, that will be the one that is selected. It is internally set transparent to the user. There is no new SQL format that has to be used in order for the Zstandard compression to be applied.
And the Database Compatibility Mode has to be at least at 23.0.0 or higher. Only then can the format of the Hybrid Column Compression storage use that Zstandard compression. If we already have compressed data blocks in existing tables, they're going to remain in their original format.
04:31
Lois: And are the objects regenerated?Bill: If the objects are-- they might be regenerated if they were deleted in another operation. If you want to completely take advantage of the new compression, all you have to do is alter table move. And that's going to go ahead and trigger the recompression of that, whereas any newly created tables that are created will use the Zstandard by default.
05:00
Nikita: What are the performance factors we need to think about, Bill?Bill: There are some performance factors that we do need to consider, the ratio, the amount of space reduction in storage that we're going to achieve, the time spent compressing the data, the CPU cost to compress that data, and also, is there any decompression rate, time spent decompressing the data when we're doing queries on it?
05:24
Lois: And not all tables are equal, are they?Bill: Not all tables are equal. Some might get better performance by different compression level than others for that. So how we can basically have to test our results, there is a compression advisor that's available, that you can use to give you a recommendation on what compression to use. But only through testing can we really see the availability, the benefits of using that compression for an application.
So best compression, just as in previous versions, the higher the compression levels, the more CPU it's going to use. The higher the compression level, the more space savings that we're going to achieve for that as we are doing those direct path inserts. So there's always that cost.
06:20
Did you know that the Oracle University Learning Community regularly holds live events hosted by Oracle expert instructors. Find out how to prepare for your certification exams. Learn about the latest technology advances and features. Ask questions in real time and learn from an Oracle subject matter expert. From Ask Me Anything about certification to Ask the Instructor coaching sessions, youāll be able to achieve your learning goals for 2024 in no time. Join a live event today and witness firsthand the transformative power of the Oracle University Learning Community. Visit mylearn.oracle.com to get started.07:01
Nikita: Welcome back! Letās now move on to the enhancements that have been made to fast ingest. Weāll begin with an overview of fast ingest, how to use it, and the improvements and benefits. And then weāll look at some features for managing fast ingest. Bill, why donāt you start by defining fast ingest for us?Bill: Traditionally the fast ingest, also referred to as deferred inserts, is faster than processing a single row at a time. It can support high-volume transactions like from the Internet of Things applications, where you have hundreds of thousands of items coming in trying to write to the database.
They are faster, because the inserts don't use the traditional buffer cache. They use a pool that will size out of the large pool. And then they're later written to disk using the SMCO, the space management coordinator. Instead of using the buffer cache, they're going to write into an area of the large pool.
The space management coordinator, it has these helper threads, however many-- that's just a number for that-- that will buffer. And as buffer is filled based off size of that algorithm, it will then write those deferred inserts into the database itself.
08:24
Lois: So, do deferred inserts support constraints?Bill: Deferred writes do support constraints in index just as for regular inserts. However, performance benchmarks that have been done recommend that you disable constraints, if you're going to use the fast ingest.
08:41
Lois: Can you tell us a bit about the streaming and ingest mechanism?Bill: We declare a table with the memoptimize for write. We can do that in the create table statement, or we can alter the table for that. The data is written to the large pool, unlike traditionally writing items to the buffer cache. It's going to write to the ingest buffer, the large pool. And it's going to be drained. It's going to be written from that area by using those background processes to write to the actual database itself.
So the very high throughput, since drainers issues deferred writes in large batches. So we're not having to wait especially for the buffer cache. OK, I need space. OK, I need to write. I need to free up blocks. Very ideal for these streaming inserts, sensor readings, alarms, door locks. Those type of things.
09:33
Nikita: How does performance improve with this?Bill: With the benchmarks we have done, we have found that the performance can be up to 75% faster by going ahead and doing the fast ingest versus traditional inserts. The 23 million inserts per second on a single X6-2 server with the benchmarks that we have.
09:58
Nikita: Are there any considerations to keep in mind?Bill: With the fast ingest, some things to consider for that. The written data, you might need to validate to make sure it's there. So you might have input files that are writing to that that are loading it. You might want to hang on to those, before that data destroyed. Have some kind of mechanism to validate, yes, it was written.
There is a possible loss of data. Why? Because unlike the buffer cache that has the recovery mechanism with the redo and the undo, there is none with that large pool. So that's why if the system crashes, and the buffers haven't been flushed yet, then it's possible loss of data.
There's no queries from the large pool meaning that if I want to query the information that the fast ingest is loading into the table, it doesn't go and see what's sitting in the buffer in the large pool like it does with the buffer cache.
Index and constraints are checked but only at flush time. And the memoptimize pool size is a fixed amount of space that we're going to allocate-- of memory that we're going to allocate to use for the memoptimize write.
We can enable a table for the fast ingest, enable with the memoptimize for write. We can create a table and do it. We can also alter a table. We already have a table existing. All we have to do is alter it. And we want to use that, the fast ingest, for these tables.
11:21
Lois: Do we have options for the writing operation, Bill?Bill: You do have options for the writing operation. We have the parameters, the memoptimize write where we can turn that on. We can also use it in a hint. It is set at the root level, it. Is not modifiable at the PDB level. It's set at the root level, It is a static parameter. We can also do things in our session. We want to verify, OK, is the memoptimize write on? We can verify a table is enabled.
So with the fast ingest, the data inserts, you can also use a hint. You can also set this at a session level.
If you decide there's something that you don't want to use the memoptimize write for, then you can disable it for a table.
12:11
Nikita: Bill, what are some of the benefits of the enhancements made in 23ai?Bill: With some of the enhancements-- so now, some table attributes are now supported-- we can now have common default values for a column. We can use transparent data encryption. We can also use the fast inserts, any inline LOBs, along with virtual columns. We've also added partitioning support. We can do subpartitioning and we can also do interval partitioning, along with auto list. So we've added some items that previously prevented us from doing the fast inserts.
It does provide additional flexibility, especially with the enhancements and the restrictions that we have removed. It allows to use that fast insert, especially in a data warehouse-type environment. It can also use-- in the Cloud, it can use encrypted tablespaces, because remember, in the Cloud, we always encrypt, by default, users' data. So now, it also gives us the ability to use it in that Cloud environment because of that change.We have faster background flushing for the loads.
13:36
Lois: And how is it faster now?Bill: Because we bypassed the traditional buffer cache. Faster ingest for those direct ingest. So again, bypassing the traditional inserts and using the buffer cache gives the ability to bulk load into large pool, then flush to the database so that way, we have access to that data for possible faster analytics of those internet of things, especially when it comes to the temperature of the temperature sensors. We need to know when a temperature of something is out of bounds very quickly. Or maybe it's sensors for security. We need to know when there's a problem with the security.
14:20
Nikita: How difficult is it to manage this?Bill: Management is fairly simple. We have the MEMOPTIMIZE_WRITE_AREA_SIZE parameter that we're going to say-- it is dynamic. It does not require a restart. However, all instances in a RAC environment must have the same value. So we have the write area. What are we going to set? And then the MEMOPTIMIZE_WRITE, by default, it uses a hint. Or we can go ahead and we can just set that to all.
It is allocated from the large pool. You manually set it. And we can see how much is actually being allocated to the pool. We can go out and look at our alert log for that information.
There's also a view. The MEMOPTIMIZE_WRITE_AREA has some columns. What is the total memory allocated for the large pool? How much is currently used by the fast ingest? How much free space? As you're using it, you might want to go out and do a little checking, or do you have enough space? Are you not allocating enough space? Or have you allocated too much?
It'll also show the total number of writes, and also, the number-- the writers is currently the users that are using it.And the container ID, what is the container within that container database? What's the pluggable or pluggables that's using the fast ingest?
There is a subprogram, the DBMS_MEMOPTIMIZE that we have access to that we possibly can use. So there are some procedures. Here, we can return the rows of the low and high water mark of the sequence numbers. And the key here is across all the sessions. We can see the high water mark, sequence number of the rows written to the large pool for the current session. And we can also flush all the ingest data from the large pool to disk for the current session.
16:26
Lois: What if I want to flush them all for all sessions?Bill: Well, that's where we have the WRITE_FLUSH procedure. So it's going to flush the fast ingest data of the Memoptimize Rowstore from the large pool for all the sessions. As a DBA, that's one that you most likely will want to be using, especially if it's going to be before I do a shutdown or something along that line.
16:49
Nikita: Ok! On that note, I think we can end this episode. Thank you so much for taking us through all that, Bill.Lois: Yes, thanks Bill. If you want to learn more about what we discussed today, visit mylearn.oracle.com and search for Oracle Database 23ai New Features for Administrators. Join us next week for a discussion on some more Oracle Database 23ai new features. Until then, this is Lois Houstonā¦
Nikita: And Nikita Abraham signing off!17:21
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast. -
In this episode, hosts Lois Houston and Nikita Abraham discuss improvements in time and data handling and data storage in Oracle Database 23ai. They are joined by Senior Principal Instructor Serge Moiseev, who explains the benefit of allowing databases to have their own time zones, separate from the host operating system. Serge also highlights two data storage improvements: Automatic SecureFiles Shrink, which optimizes disk space usage, and Automatic Storage Compression, which enhances database performance and efficiency. These features aim to reduce the reliance on DBAs and improve overall database management. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-new-features-for-administrators/137192/207062 Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. --------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26
Nikita: Welcome to the Oracle University Podcast! Iām Nikita Abraham, Principal Technical Editor with Oracle University, and joining me is Lois Houston, Director of Innovation Programs.
Lois: Hi there! Over the past two weeks, we've delved into database sharding, exploring what it is, Oracle Database Sharding, its benefits, and architecture. Weāve also examined each new feature in Oracle Database 23ai related to sharding. If that sounds intriguing to you, make sure to check out those episodes. And just to remind you, even though most of you already know, 23ai was previously known as 23c.
01:04
Nikita: Thatās right, Lois. In todayās episode, weāre going to talk about the 23ai improvements in time and data handling and data storage with one of our Senior Principal Instructors at Oracle University, Serge Moiseev. Hi Serge! Thanks for joining us today. Letās start with time and data handling. I know there are two new changes here in 23ai: the enhanced time zone data upgrade and the improved system data and system timestamp data handling. What are some challenges associated with time zone data in databases?
01:37
Serge: Time zone definitions change from time to time due to legislative reasons. There are certain considerations. Changes include daylight savings time when we switch, include the activity that affects the Oracle Database time zone files.
Time zone files are modified and used by the administrators. Customers select the time zone file to use whenever it's appropriate. And customers can manage the upgrade whenever it happens.The upgrades affect columns of type TIMESTAMP with TIME ZONE. Now, the upgrades can be online or offline.
02:24
Lois: And how have we optimized this process now?
Serge: Oracle Database 23c improves the upgrade by reducing the resources used, by selectively using the updates and minimizing the application impact. And only the data that has dependencies on the time zone would be impacted by the upgrade.
The optimization of the time zone file upgrade does not really change the upgrade process, so upgrade can be done offline. Database would be unavailable for a prolonged period of time, which is not optimal for today's database availability requirements.
Online upgrade, in this case, we want to minimize the application impact while the data is being upgraded. With the 23c database enhancement for time zone file change handling, the modified data is minimized, which means that the database updates only impacted rows. And it reduces the impact to the applications and other database operations.
03:40
Nikita: Serge, how does updating only the impacted rows improve the efficiency of the upgrade process?
Serge: The benefits of enhanced timezone update include customers who manage large fleet of databases. They will benefit tremendously with a lower downtime. The DBAs will benefit due to the faster updates and less resource consumption needed to apply those updates. And that improves the efficiency of the update process.
Tables with no affected data are simply skipped and not touched. All results in the significant resource savings on the upgrade of the time zone files. It applies to all customers that utilize timestamp with time zone columns for their data storage.
04:32
Lois: Excellent! Now, what can you tell us about the improved system data and system timestamp data handling?
Serge: Date and time in Oracle databases depends on the system time as well as the database settings. System time now can be set as the local time zone for an individual database.
04:53
Nikita: How was it before this update?
Serge: Before 23c, the time has always matched the time zone of the database host operating system. Now, imagine that we use either multitenant environments or cloud-based environments when the host OS system time zone is not really the same as the application that runs in a different geographic locality or affects data from other locations.
And system time obviously applies not only to the data stored and updated in the database rows but also to the scheduler, the flashback, to a place to materialized view refresh, Recovery Manager, and other time-sensitive features in the database itself.
Now, with the database time versus operating system time, there is a need to be more selective. It is desired that the applications use the same database time in the same time zone as the applications are actually being used in.
And multitenant and cloud databases will certainly experience a mismatch between the host operating system time zone, which is not local for the applications that run in some other geographical locations or not recognizing some, for example, daylight savings time.
So migration challenge is obviously present. If you want to migrate from a specific on-premises database to either multitenant or cloud, you would experience the host operating system time zone by default.
06:38
Lois: And thatās obviously not convenient for the applications, right?
Serge: Well, the database-specific time in Oracle Database 23c, any cloud database can set local time zone to whatever the customer's requirements are explicitly. And any pluggable database can also set its own local time zone to customer's requirements, not inheriting the time zone from the container database it is currently running in.
This simplifies migration to multitenant or cloud for applications that are time-sensitive. And it offers more intuitive, easier database monitoring, and development.
07:23
Working towards an Oracle Certification this year? Take advantage of the Certification Prep live events in the Oracle University Learning Community. Get tips from OU experts and hear from others who have already taken their certifications. Once youāre certified, youāll gain access to an exclusive forum for Oracle-certified users. What are you waiting for? Visit mylearn.oracle.com to get started.
07:51
Nikita: Welcome back! Letās move on to the data storage improvements. We have two updates here as well, automatic secure file shrink and automatic storage compression. Letās start with the first one. But before we get into it, Serge, can you explain what SecureFiles are?
Serge: SecureFiles are the default storage mechanism for large objects in Oracle Database. They are strongly recommended by Oracle to store and manage large object data.
The LOBs are stored in segments. Those segments may incur large amounts of free space over time. Because of the updates to the LOB data, the fragmentation of the space used is growing depending, of course, on the frequency and the scope of the updates.
The storage efficiency could be improved by shrinking segments with the free space removed. And manual secure files shrinking has become available since Oracle Database 21c, requiring administrators to perform these tasks manually.
Traditional SecureFiles required the time-consuming DBA activities. DBAs would need to manually identify eligible LOB segments either using Segment Advisor or PL/SQL or built-in database views.Once identified, the administrators would manually execute shrink operations on very large LOBs which takes too much time and may result in excessive disk space consumption. For example, code to operate this shrinking would look like ALTER TABLE some table SHRINK SPACE CASCADE.
That would shrink all LOB segments in a particular table. If you want to scope the shrinking to a single column, the code would be required to ALTER TABLE some table MODIFY LOB, followed by the column name SHRINK SPACE.
This affects only a single column in a table with LOBs.
10:01
Lois: So, how has automatic secure shrinking made things better?
Serge: Automatic SecureFile shrink removes the emphasis from the DBAs to manually perform these tasks. And it results in the more optimal use of space over time.
It is integrated into the automated database maintenance tasks. The automation once enabled runs every 30 minutes, collects eligible LOB segments, and shrinks them offline. The execution time and freed space would vary depending on the fragmentation and the size of the LOBs. Each shrink execution may reclaim up to 5 gigabytes of unused disk space from each LOB segment that is idle.
On the high level, automatic SecureFile shrink improves the Oracle Database 23c storage usage efficiency. It is part of the ongoing Oracle Database improvement effort and transparently reclaims the free space with negligible to no impact on performance of the database operations.
Again, this is done in the background without affecting the running processes. It makes Oracle database 23c less dependent on the DBA activities while reducing the disk space required to store SecureFiles, reducing the usage of LOB segments.
Automatic securefile shrink runs incrementally in small steps over time. Some of the features are tunable. And it is supported for all types of large objects, storage, compressed, encrypted, and duplicated the object segments.
11:50
Nikita: Right, and note that this feature is turned on out-of-the-box in the Autonomous Database 23ai in Oracle Cloud. Now, letās talk about Automatic Storage Compression, Serge.
Serge: With Automatic Storage Compression and Automatic Clustering, the storage compression gives you the background compression functionality. Directly loaded data is first uncompressed to speed up the actual load process. Rows are then moved into hybrid columnar compression format in the background asynchronously.The automatic clustering applies advanced heuristic algorithms to cluster the stored data depending on the workload and data access patterns and the data access is optimized to more efficiently make use of database table indices, zone maps, and join zone maps.
Automatic Storage Compression advantages include the improvements to Oracle Database 23c storage efficiency as well. It is part of the continuous improvement, part of the ongoing Oracle Database improvement effort. And it brings performance gains, speeds up uncompressed data loads while compressing in the background.
The latencies to load and compress data are because of that also reduced. With the hybrid columnar compression in particular, this works in combination.
And it results in less DBA activities, makes the Database Management less dependent on the DBA time and availability and effort.
Automatic Storage Compression performs operations asynchronously on the data that has already been loaded. To control Automatic Storage Compression on-premises, it must be enabled explicitly. And you have to have heatmap enabled on your Oracle Database objects.
Table must use hybrid columnar compression and be placed on the tablespace with the SEGMENT SPACE MANAGEMENT AUTO and allowing autoallocation. And this feature, again, is transparent for the Autonomous Database 23c in the Oracle Cloud.
14:21
Lois: Thanks for that quick rundown of the new features, Serge. We really appreciate you for taking us through them. To learn more about what we discussed today, visit mylearn.oracle.com and search for the Oracle Database 23ai New Features for Administrators course. Join us next week for a discussion on some more Oracle Database 23ai new features. Until then, this is Lois Houstonā¦
Nikita: And Nikita Abraham signing off!
14:50
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast. -
Join hosts Lois Houston and Nikita Abraham in Part 2 of the discussion on database sharding with Ron Soltani, a Senior Principal Database & Security Instructor. They talk about sharding native replication, directory-based sharding, and coordinated backup and restore for sharded databases, explaining how these features work and their benefits. Additionally, they explore the automatic bulk data move on sharding keys and the ability to split and move partition sets, highlighting the flexibility and efficiency they bring to data management. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-new-features-for-administrators/137192/207062 Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26
Lois: Hello and welcome to the Oracle University Podcast. Iām Lois Houston, Director of Innovation Programs with Oracle University, and with me is Nikita Abraham, Principal Technical Editor.
Nikita: Hi everyone! In our last episode, we dove into database sharding and Oracle Database Sharding in particular. If you havenāt listened to it yet, Iād suggest you go back and do so before you listen to this episode because it will give you a lot of context.
00:53
Lois: Right, Niki. Today, we will discuss all the 23ai new features related to database sharding. We will cover sharding native replication, directory-based sharding, coordinated backup and restore for sharded databases, and a few more.
Nikita: And weāre so happy to have Ron Soltani back on the podcast. If you donāt already know him, Ron is a Senior Principal Database & Security Instructor with Oracle University. Hi Ron! Letās talk about sharding native replication, which is RAFT-based, meaning that it is reliable and fault tolerant-based, usually providing subzero or subsecond zero data loss replication support. Tell us more about it, please.
01:33
Ron: This is completely transparent replication built in within Oracle sharding that duplicates data across the different shards. So data are generally put into chunks. And then the chunks are replicated either between three or five different shards, depending on how much of the fault tolerance is required.
This is completely provided by the Oracle sharding database, and does not require use of any other component like GoldenGate and Data Guard. So if you remember when we talked about the architecture, we said that each shard, each database can have a Data Guard component, whether through GoldenGate or whether through Data Guard to have a standby.
And that way support high availability with the sharding native replication, you don't rely on the secondary database. You actually-- the shards will back each other up by holding replicas and being able to globally manage the replica, make sure everything is preserved, and manage all of the fault operations.
Now this is a logical replication, generally consensus-based, kind of like different components all aware of each other. They know which component is good, depending on the load, depending on the failure. The sharded databases behind the scene decide who is actually serving the data to the client. That can provide subsecond failovers with zero data loss.03:15
Lois: And what are the benefits of this?
Ron: Major benefits for having sharding native replication is that it is completely transparent to the application or any of the structures. You just identify that you want to go ahead and use this replication and identify the replication factor. The rest is managed by the Oracle sharded database behind the scene.
It supports fast failover with zero data loss, usually subsecond failovers. And depending on the number of replicas, it can even tolerate multiple failures like two server failures.And when the loads are submitted, the loads are also load-balanced across all of these shards based on where the data is located, based on the replicas. So this way, it can also provide you with a little bit of a better utilization of the hardware and load administration.
So generally, it's designed to help you keep your regular SQL-based databases without having to resolve to FauxSQL or NoSQL environment getting into other databases.
04:33
Nikita: So next is directory-based sharding. Can you tell us what directory-based sharding is, Ron?
Ron: Directory-based sharding basically allows the user to define the values that are used and combined for different partition, so better control, location of the data, in what partition, what shard. So this allows you to set up a good configuration.
Now, many times we may have a key that may not be large enough for hash partitioning to distribute the data enough. Sometimes we may not even know what keys are going to come in the future. And these need to be built in the future. So having to build these, you really don't want to have to go reorganize the whole data based on new hash functions, and so when data cannot be managed and distributed using hash partitioning or when we need full control over combination of where data exists.
05:36
Lois: Can you give us a practical example of how this works?
Ron: So let's say our company is very small in three different countries. So I can combine those three countries into one single shard. And then have three other big countries, each one sitting in their own individual shards. So all of this done through this directory-based sharding. However, what is good about this is the directory is created, which is a table, created behind the scene, stored in the catalog, available to the client that is cached with them, used for connection mapping, used for data access. So it can give you a lot of very high-level benefits.
06:24
Nikita: Speaking of benefits, what are the key advantages of using directory-based sharding?
Ron: First benefit allow you to group the data together based on the whatever values you want, depending on what location you want to put them as far as across the shards are concerned. So all of that is much better and easier controlled by us or by the designers. Now, this is when there is not enough values available. So when you're going to use hash-based partition, that would result into an uneven distribution of the data.
Therefore, we may be able to use this directory for better distribution of the data since we understand the data structure better than just the hash function. And having a specification where you can go ahead and create future component, future partitions, depending on how large they're going to be. Maybe you're creating them with an existing shard, later put them in another shard. So capability of having all of those controls become essential for management of this specific type of data.
If a shard value, the key value is required, for example, as we said, client getting too big or can use the key value, split it or get multiple key value. Combine them. Move data from one location to another. So all of these components maintain automatically behind the scene by us providing the changes. And then the directory sharding and then the sharded database manages all of the data structure, movement, everything behind the scene using some of the future functionalities.And finally, large chunk of data, all of that can then be moved from one location to another. This is part of the automatic chunk data move and whatnot, but utilized within the directory-based sharding to allow us the control of this data and how we're going to move and manage the data based on the load as the load or the size of the data changes.
08:50
Lois: Ron, what is the purpose of the coordinated backup and restore system in Oracle Database Sharding?
Ron: So, basically when we talk about a coordinated backup and restore, remember in a sharded database, I have different databases. Each database is a shard. When you take a backup, each database creates its own backup.
So to have consistent data across all of the shards for the whole schema, it is extremely important for these databases to be coordinated when the backup is taken, when the restore is being done. So you have consistency of the data maintained across all of the shards.
09:28
Nikita: So, how does this coordination actually happen?
Ron: You don't submit this through our main. You submit this through the Global Management tool that is used for the sharded database. And it's the Global Management tool that is actually submit your request to each database, but maintains the consistency of when the actual backup is taken, what SCN.
So that SCN coordination across all of the shards is then maintained for the backup so you can create a consistent backup or restore to a consistent point in time across the sharded database. So now this system was enhanced in 23C to support multiple destinations.So you can now send your backup to an object store. You can send it to ZDLRA. You can send it to Amazon S3. So multiple locations can now be defined where you can send these backups to. You can also use multiple recovery catalogs.
So let's say I have data that is located on different countries and we have requirement that data for each country must stay in that country. So I need to also use a separate catalog to maintain that partition.So now I can use multiple catalog and define which catalog is maintaining which partition to satisfy those type of requirements or any data administration requirement when it comes to backup recovery. In addition, you can also now specify different type of encryption to be used, whether you want to have different type of encryption algorithm for each of the databases that you're backing up that is maintained. It can be identified, and then set up for each one of those components.
So these advancements now allow you to manage this coordinated backup and restore with all of the various specific configuration that may be required based on the data organization. So the encryption, now can also be done across that, as I mentioned, for different algorithms. And you can define different components.
Finally, there is much better error handling and response available through this global system. Since things have been synchronized, you get much better information into diagnosing any issues.
12:15
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12:41
Nikita: Welcome back! Continuing with the updatesā¦ next up is the automatic bulk data move on sharding keys. Ron, can you explain how this works and why it's significant?
Ron: And by the way, this doesn't have to be a bulk data. This could be just an individual row or it could be bulk data, a huge piece of data that is going to be moved.
Now, in the past, when the shard key of an existing record was going to be updated, we basically had to remove that row from the table, so moving it to a temporary table or moving it to another location. Basically, you're deleting the row, and then change the value and reinsert the row so the row would then be inserted into the proper location.
That causes a lot of work and requires specific code-writing and whatnot to manage those specific type of situations. And of course, if there is a lot of data, now, you're moving those bulk data in twice.
13:45
Lois: Yeahā¦ youāre moving it to one location and then moving it back in. Thatās a lot of double work, not to mention that it all needs to be managed manually, right? So, how has this process been improved?
Ron: So now, basically, you can just go ahead and update the value of the partition key, and then data will then automatically move to the new location. So this gives you complete flexibility of the shard key values.
This is also completely transparent, and again, completely managed behind the scenes. All you do is identify what is going to be changed. Then the database will maintain the actual data location and movement behind the scenes.
14:31
Lois: And what are some of the specific benefits of this feature?
Ron: Basically, it allows you to now be flexible, be able to update the shard key without having to worry about, oh, which location does this value have to exist? Do I have to delete it, reinsert it? And all of those different operations.
And this is done automatically by Oracle database, but it does require for you to enable row movement at the table level. So for tables that are expected to have partition key updates kind of without knowing when that happens, can happen, any time it happens by the clients directly or something, then we may need to enable row movement at the table level and leave it enabled. It does have tiny bit of overhead of maintaining these row locations behind the scenes when enabled, as it maintains some metadata behind the scenes.
But for cases that, let's say I know when the shard key is going to be changed, and we can use, let's say, a written procedure or something for that when the particular shard key is going to be changed. Then when the shard key is updated, the data will then automatically move to the new location based on that shard key operation. So we don't need to move the data manually in and out or to different locations.
16:03
Nikita: In our final segment, I want to bring up the update on splitting and moving a partition set, or basically subpartitioning tables and then being able to move all of the data associated with that in a bulk data move to a new location. Ron, can you explain how this process works?
Ron: This gives us a lot of flexibility for data management based on future requirements, size of the data, key changes, or key management requirements.
So generally when we use a composite sharding, remember, this is a combination of user-defined partitioning plus the system partitioning put together. That kind of defines a little bit more control over how the shards are, where the data is distributed evenly across the shards.
So sometimes based on this type of configuration, we may actually need to split partition and that can cause the shard key values to be now assigned to a new shard space based on the partitioning reconfiguration. So data, this needs to be automatically managed. So when you go ahead and split partition or partitionsets, then the data based on your configuration, based on your identification can automatically move to the new location automatically between those shard spaces.
17:32
Lois: What are some of the key advantages of this for clients?
Ron: This provides a huge benefit to clients because it allows them flexibility of better managing their configuration, expanding both configuration servers, the structures for better management of the data and the load. Data is completely online during all of this data move. Since this is being done behind the scenes by the database, it does not impact the availability of the data for anyone who is actually using the data.
And then, data is generally moved using transportable tablespaces in big bulk and big chunks. So it's almost like copying portions of the files. If you remember in Oracle database, we could take a backup of big files as image copy in pieces. This is kind of similar where chunks of data can then be moved and then transported if possible depending on the organization of the data itself for those particular partitions.
18:48
Lois: So, what does it look like in practice?
Ron: Well, clients now can go ahead and rearrange their data structure based on the adjustments of the partitioning that already exists within the sharded database. The bulk data move then automatically triggers once the customer execute the statement to go ahead and restructure the partitioning. And then all of the client, they're still accessing data. All of the data operation are completely maintained behind the scene.
19:28
Nikita: Thank you for joining us today, Ron. If you want to learn more about what we discussed today, visit mylearn.oracle.com and search for the Oracle Database 23ai New Features for Administrators course. Join us next week for a discussion on some more Oracle Database 23ai new features. Until then, this is Nikita Abrahamā¦
Lois: And Lois Houston signing off!
19:51
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast. -
In this two-part episode, hosts Lois Houston and Nikita Abraham are joined by Ron Soltani, a Senior Principal Database & Security Instructor, to discuss the ins and outs of database sharding. In Part 1, they delve into the fundamentals of database sharding, including what it is and how it works, specifically looking at Oracle Database Sharding and its benefits. They also explore the architecture of a sharded database, examining components such as shards, shard catalogs, and shard directors. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-new-features-for-administrators/137192/207062 Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26
Nikita: Hello and welcome to the Oracle University Podcast. Iām Nikita Abraham, Principal Technical Editor with Oracle University, and with me is Lois Houston, Director of Innovation Programs.
Lois: Hi there! The last two weeks of the podcast have been dedicated to all things database security. We discussed why itās so important and looked at all the new features related to database security that have been released in Oracle Database 23ai, previously known as 23c.
00:55
Nikita: Todayās episode is also going to be the first of two parts, and weāre going to explore database sharding with Ron Soltani. Ron is a Senior Principal Database & Security Instructor with Oracle University. Weāll ask Ron about what database sharding is and then talk specifically about Oracle Database Sharding. Weāll look at the benefits of it and also discuss the architecture.
Lois: All this will help us to prepare for next weekās episode when we dive into each 23ai new feature related to Oracle Database Sharding. So, letās get to it. Hi Ron! Whatās database sharding?01:32
Ron: This is basically an architecture to allow you to divide data for better computing and scaling across multiple environments instead of having a single system performing the work. So this allows you to do hyperscale computing and other different technologies that are included that will allow you to distribute your queries and all other requests across these multiple components to be able to get a very fast response.
Now many times with this distributed segment across each kind of database that is called a shard allow you to have some geographical location component while you are not really sharing any of the servers or the components. So it allows you separation and data management for each of the shards separately. However, when it comes to the application, the sharded database is totally invisible. So as far as the application is concerned, they connect to a global service, submit their statements. Everything else is managed then by the sharded database underneath.With sharded tables, basically it gets distributed across each shard. Normally, this is done through horizontal partitioning. And then the data depending on the partitioning scheme will be distributed across like server A, server B, server C, which are independent servers that are running independent databases.
03:18
Nikita: And what about Oracle Database Sharding specifically?
Ron: The Oracle Database Sharding allows you to automate how the data is distributed, replicated, and maintain the kind of a directory that defines the complete sharding scheme, while everything is distributed across many servers with no sharing whether the hardware or software. It allows you to have a very good scaling to be able to scale based on this partitioning across all of these independent servers.
And based on the subset and the discrete data configuration, you can go ahead and distribute this data across these components where each shard is an independent data location or data component, a subset of data that can be used, whether individually on its own or globally across all of the shards together. And as we said to the application, the Oracle Database Sharding also looks as a single component.
04:35
Lois: Ron, what are some of the benefits of Oracle Database Sharding?
Ron: With Oracle Database, you basically have linear scaling capability across as many shards as you like. And all of the different database configurations are supported with this. So you can have rack databases across the shards, Oracle Data Guard, GoldenGate. So all of the different components are still used to give you all of the high availability and every other kind of functionality that we generally used to having a single database with.
It provides you with fault toleration. So each component could be down. It could have its own replicated data. It doesn't affect other location and availability of the data in those other locations.
And finally, depending on data sovereignty and configuration, you could actually distribute data geographically across the different locations based on requirements and also data access to provide a higher speed for local data management.
05:46
Lois: Iād like to understand more about the architecture of Oracle Database Sharding. Ron, can you first give us a broad overview of how Oracle Database Sharding is structured?
Ron: When it comes to dealing with Oracle Database architecture, the components include, first, your shards. The shards-- each one is an independent Oracle Database depending on the partitioning you decide on a partition key and then how the actual data is divided across those shards.
06:18
Nikita: So, these shards are like separate pieces of the database puzzleā¦Ok. Whatās next in the architecture?
Ron: Then you have shard catalog. Shard catalog is a catalog of your sharding configuration, is aware of all of the components in the shard, and any kind of replicated object that master object exists in the shard catalog to be maintained from there.
And it also manages the global queries acting as a proxy. So queries can be distributed across multiple shards. The data from the shards returned back to the catalog to group together and then sent back to the client.Now, this shard catalog is basically another version of an Oracle Database that is created independently of the shards that include the actual data, and its job is to maintain this catalog functionality.
07:19
Nikita: Got it. And what about the shard director?
Ron: The shard director is like another form of a global service manager.So it understands the sharding by being able to access the catalog, knows where everything exists. The client connection pool will hit the shard director. In general, communication and then whether it's being distributed to the shard catalog to be able to proxy it, or, if the key is available, then the director can send the query directly to the shard based on the key where the data exists. So the shard can then respond to the client directly. So all of the connection pool and the components for global administration, generally managed by the shard director.
08:11
Nikita: Can we dive into each of these components in a little more detail? Letās go backwards and start with the shard director.
Ron: The shard director, as we said, this is like a global service manager. It acts as a regional listener where all of the connection requests will be coming to the shard director and then distributed from that depending on the type of connection that is being used.
Now the director understands the topology--maintains the complete understanding of the mapping of the data against the shards. And based on the shard key, if the request are specified on the specific key, it can then route the connection request directly to the shard that is appropriate where the data resides for the direct response.
09:03
Lois: And what can you tell us about the shard catalog?
Ron: The shard catalog, this is another Oracle Database that is created for special purpose of holding the topology of the sharded database. And have all of the centralized information metadata about your sharded database. It also act as a proxy.
So, if a client request comes in without providing a shard key, then the request would go to the catalog. It can be distributed to all of the shards. So the shards that you actually have the data can respond, but the data can then be combined and sent back to the client. So, it also creates the master copy of all the duplicate tables that are created in the shard database.09:56
Lois: Ok. Iāve got it. Now, letās talk more about the shards themselves.
Ron: Each shard is basically a database. And data is horizontally partitioned to be placed on each of these shards. So, this physical database is called the shard. And depending on the topology of your sharding, there could be user sharding, for example, where multiple keys are in a single shard or could be a system sharding that based on the hash value data is distributed whether singly or multiple data components across each shard.
Now, this is completely transparent to the application. So, as far as application is concerned, this is a single database and the response everything that they do is generally just operating as a single database interaction.However, when it comes to the administrators, each shard is a separate database. Each shard can be managed independently and can have its own standby and other components that is then set up for high availability and management of the data operations.
11:21
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Nikita: Welcome back! Letās move on to global services and the various sharding methods. Ron, can you explain what global services are and how they function in a sharded database?
Ron: Global services is generally the service that is used for the application to be able to connect to the sharded database. This is provided and supported through the shard director. So clients are routed using this global service.12:11
Lois: What are the different sharding methods that are available?
Ron: When it comes to sharding methods that were available, originally we started with the system sharding, which is a hash partition, basically data is distributed evenly across the shards. Then we needed to allow for the user-defined sharding because sometimes it's not about just distributing the data evenly, it's also about controlling where the data goes to be able to control individual query execution based on the keys. And even for data sovereignty and position of the data itself.
And then a composite sharding, which provides you kind of a combination of the user-defined sharding and the system hash sharding that gives you a little bit of a combination of the two to better distribute your data across the shard.
And finally, sub-partitioning all types of sub-partitionings are supported to provide a better structure of the data depending on the application schema design.
13:16
Nikita: Ron, how do clients typically connect to a sharded database?
Ron: When it comes to the client connections, all the client connections are generally routed to the director and then managed from there. So there are multiple ways that clients can connect. One could be a direct connect. With a direct connect, they're providing the shard key in the request. Therefore, the director knowing the topology can route the client directly to the shard that has the data.
The proxy routing is done by the catalog. This is when generally a shard key is not provided or data is requested from many shards. So data will then request is then sent to the catalog. The catalog database will then distribute the query to the shards, collects the results, and then combine sending it back to the client acting as a proxy sitting in the middle.
And the middle tier routing, this is when you can expose the middle tier to the structure of your sharding. So when the middle tier send the request, the request identifies which shard the data is going to. So take advantage of that from the middle tier. So the data is then routed properly. But that requires exposing the structures and everything in the middle tier.
14:40
Lois: Letās dive a bit deeper into direct routing. What are the advantages of using this method?
Ron: With the client request routing, as we talked about the direct routing, this allows the applications to get very quick data access when they know the key that is used for the distribution of the data. And that is used to access the data from the shard.
This provides you a direct connection to a shard from the shard director. And once the connection is established, then the queries can get data directly across the shard with the key that is supplied. So the RAC respond for that particular subset of data with the data request.Now with the direct routing again, you get some advantages. The advantage is you have much better performance for capturing subset of the data because you don't have to wait for every shard to respond for a particular query.
If you want to distribute data geographically or based on the specific key, of course, all of that is perfectly supported. And kind of allows you to now distribute your query to actually the location where the data exists.
So for example, data that is in Canada can then be locally accessed in Canada through this direct access. And of course, when it comes to management of your client connection, load balancing of those connections. And of course, supporting all types of queries and application requests.
16:18
Nikita: And what about routing by proxy?
Ron: The proxy routing is when queries do not supply the actual sharding key, where identifies which shard the data reside. Or the actual routing cannot be properly identified. Then the shard director will send the request to the catalog performing the work as the proxy.
So proxy will then send a request to all of the shards. If any shards can be eliminated, would be. But generally all of the shards that could have any portion of the data will then get the request. The requests are then sent back to the proxy. And then the proxy will then coordinate the data going back and forth between the client.
And the shard catalog basically hands this type of data access to the catalog to act as the proxy. And then the catalog is-- the shard director is no longer part of the connection management since everything is then handled by the shard catalog itself.
17:37
Lois: Can you explain middle tier routing, Ron?
Ron: This generally allows you to use the middle tier to define which shard your data is being routed into. This is a type of routing that can be used where the data geographically have some sovereignty or the application is aware of the structure.
So the middle tier is exposed to the sharded database topology. So understand exactly what these components are based on the specific request on the shard key, then the middle tier can then route the application to the appropriate location for the connection.And then the middle tier, and then the either one shard or the subset of shard will maintain those connections for the data access going back and forth since the topology is now being managed by the middle tier. Of course, all of the work that is done here still is known in the catalog, will be registered in the catalog. So catalog is fully aware of any operations that are going on, whether connection is done through middle tier or through direct routing.
18:54
Nikita: Ron, can you tell us how query execution and DDL operations work in a sharded database?
Ron: When it comes to the query execution of the application, there are no changes, no requirement for identifying specifically how the data is distributed. All of that is maintained behind the scene based on your sharding topology.
For the DDL, most of your tables, most of the structures work exactly the same way as it did before. There are some general structures that are associated to the sharded database that we will originally create and set up with mapping. Once the mappings are configured, then the rest of the components are created just like a regular database.
19:43
Lois: Ok. What about the deployment process? Is it complicated to set up a sharded database?
Ron: The deployment for the sharded database is fully automated using Terraform, Kubernetes, and scripts that are put together. Basically what you do is you provide some of your configuration information, structure of your topology through an input file, like a parameter file type of a thing.
And then you execute the scripts and then it will build everything else based on the structure that you have provided.
20:19
Nikita: What if someone wants to migrate from a non-sharded database to a sharded database? Is there support for that?
Ron: If you are going to migrate from a regular database to a sharded database, there are two components that are fully shard aware.
First, you have the Shard Advisor. This can look at your current structure, the schema, how the data is distributed. And the workload and how the data is used to give you recommendation in what type of sharding would work best based on the workload.
And then Data Pump is fully aware of the sharding component. Normally, we use Data Pump and load into each of the databases individually on its own. So instead of one job having to read all the data and move data across many shards, data can be loaded individually across each shard using Data Pump for much faster operations.
21:18
Lois: Ron, thank you for joining us today. Now that weāve had a good understanding of Oracle Database Sharding, weāll talk about the new 23ai features related to this topic next week.
Nikita: And if you want to learn more about what we discussed today, visit mylearn.oracle.com and search for the Oracle Database 23ai New Features for Administrators course. Until next week, this is Nikita Abrahamā¦
Lois: And Lois Houston signing off!
21:45
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
-
In this episode, hosts Lois Houston and Nikita Abraham continue their exploration of Oracle Database 23ai's database security capabilities. They are joined once again by Ron Soltani, a Senior Principal Database & Security Instructor, who delves into the intricacies of the new hybrid read-only mode for pluggable databases, the flexibility of read-only users and sessions, and the newly introduced developer role. They also discuss simplified schema-level privileges and the integration of Azure Active Directory with Oracle Database. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-new-features-for-administrators/137192/207062 Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. --------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26
Lois: Hello and welcome to the Oracle University Podcast. Iām Lois Houston, Director of Innovation Programs with Oracle University, and with me today is Nikita Abraham, Principal Technical Editor.
Nikita: Hi everyone! In our last episode, we discussed database security, why it is so important, and all its different components. Today, weāre going to be continuing that conversation by looking at all the new features related to database security that have been released in Oracle Database 23ai, previously known as 23c.
00:59
Lois: And weāre so happy to have Ron Soltani back as our guide. Ron is a Senior Principal Database & Security Instructor with Oracle University. Hi Ron! Thanks for joining us again! We have a list of the new features related to database security and weād like to ask you about them one by one, starting with the new mode for pluggable databases. Whatās that about?
01:21
Ron: With the hybrid read-only mode for pluggable database, the database could be in the read/write mode or read-only mode, depending on the user that is actually connected. So one of the things we have to realize is the regular read-only mode has one major issue. The major issue is everything, including data dictionary, including SysAux and all of the other elements are also locked up read-only.
So we cannot do any database maintenance. We cannot collect statistics to monitor anything. So you pretty much have to hard tune everything for the load you want and maintain everything. And this happens in many warehouse environments, in environments where the data itself is generally loaded. And then just heavily read. So it requires to be in a read-only mode to protect it.
So with a hybrid read-only mode, if you are a local user in the PDB, even a PDB administrator-- so I can create a local user in the PDB as a PDB administrator. And grant that PDB administrator even sysdba privilege. But once the PDB is open hybrid read-only mode, even for that user, the PDB is read-only. However, if a common user connect, who is, as you know, is a CDB user. Generally, CDB-level privileges granted and considered CDB administrators.
If they connect to the PDB, then the PDB is actually in read/write mode. So now, they can take snapshots. They can use all of the database tools to monitor how things are going. They can perform maintenance. So this allows us to be able to perform patching, maintenance, and other database-related operation.
03:17
Nikita: So you donāt have to flip back and forth between read-only, read/write, read-only, read/writeā¦
Ron: Because you know if we have database read/write to go to read-only, generally, we would have to shut down the database, then go to read-only. Then from read-only, we can go to read/write. But then going back to read-only, we have to shut down again.
Lois: Which was the issue with the normal read-only on the pluggable database, right? Iām glad thatās been made easier. Okā¦ Moving on to the next new feature, which is read-only users and sessions. What can you tell us about this one, Ron?
03:51
Ron: As we previously discussed, you can put the PDB in the hybrid read-only mode. But then now the PDB is read-only for all local application users. However, let's say we have an environment where you have multiple application users.
One needs to be able to perform maintenance and perform updates where other sessions who are just reading the data to protect against all security element, and then better performance and operation management. We are going to set up read-only.So setting up read-only at the pluggable database, that can be very high level depending on the application need. So with the read-only users and session, this will give you capability of setting read-only either for a particular user.
So when the user connects, all the user can do is read-only process. We do a lot of testing, for example. And we have users that may have read/write privilege in the test environment, then we want to go ahead and perform other operation.
So we would have to take privileges away, set the read-only, then go back and change again to read/write. So performing all of those different type of tests and even with the development has always been an issue.
So having granular capability of managing at a user or a session level can give us a major benefit of better granularly managing all application needs without sacrificing either security or having extra components that would have to be done by administrators.
05:33
Nikita: Yeah, this gives you a lot of flexibility and you donāt have to keep temporarily changing privileges or configuring specific types of sessions. Itās also an easy way to control user behavior, right?
Ron: An application, as we said, have the schema owner that today we want to have a schema-only user for the schema owner. That is usually nobody connect us.
But then we have multiple schema users that one may be used for performing updates, one is used for administration, and one can be used for read-only. So this can give me a mechanism to manage that, or if a particular operation needs to run and for security purposes, that particular session needs to be set to read-only. So that gives us major control over it.
And in the cloud environment, this can be a very, very good component for better managing all of the security levels, where you can enable very fine-grained control while supporting all functionality of the application.
06:39
Lois: Ok. So, can you tell us about this new developer role in the database?
Ron: If we think about application administration, usually we create a schema owner. And we start by giving that the schema owner privileges-- grant them a resource role. By having resource role, they can create simple objects. But when you design an application, you need to implement it, test that, and then deploy it.
Today, there are many, many complex objects that can be used at the application level to manage the application. So today, we grant the resource role to the schema owner. Then we wait until they complain. They don't have privilege for certain object they want to create. Then we're going to have to grant them privileges as needed, and that used to be the way the security had worked.
But today since we have a schema only account where we can only enable the account when we want to do any type of schema work, and then it's locked up so the schema is protected, giving the schema owner the application role, the DB application role, now that has all the privileges in it, should not cause any security issue when managed properly, and will provide them with all of the privileges that they need to perform their work, including there are many complex schema structure like analytical views, hierarchies, dimensions, data-specific types that you can create.
And many of these type of privileges are not just assigned through a regular privilege assignment. Some of them are assigned through procedures.
08:21
Lois: And could you give us some examples of how this feature could be used?
Ron: So there are many different ways of granting all of these granule privileges. So at the time that we go ahead and perform development of the schema and all of that depending on what's available, we don't know really what privileges do we need.
And as we said, there are many packages that we may be able to use to create complex objects that then gradually have to go ahead and get privileges on executing those packages and to be able to use them. And as we said at the time we actually performed the application, many of these objects, we may not even know we're going to use them until later on becomes evident or it may be a better structure to represent what we want.So having to add and continuously deal with these type of changes can become extremely kind of cumbersome and tedious. It also delays all of the operations, especially now that the application schema owner can be secured. So we can grant this developer role to the schema owner, give the schema owner all privileges that is needed very quickly that they can now manage their schemas and manage all complex objects for that schema operation.
So the role is called db developer role. And just like any other role, you would connect as an administrator, grant db developer role to the schema owner. Now, we don't need to grant the resource role and all other things, because everything here is included in the db developer role.
10:01
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Nikita: Welcome back! Ron, how have schema-level privileges been simplified in 23ai?
Ron: To be able to understand this, first we can review the privilege assignment in Oracle Database. First, you can be granted a privilege at an object level, so you can perform certain work on a particular object.
However, let's say I have a user account that I'm going to use an app user who's going to have to read from multiple objects within a particular schema. Now this granting at the object level is too low because I have to go at each object and assign the privileges needed on that particular object to the user.
Or we had our system privilege, for example, grant create any table to a user. The problem with that is now you can create any table within the schema that I want you to work with. But that privilege goes across all the schemas in the database, of course, not the database schemas itself-- those are protected, but across all user schemas.
11:34
Lois: Right. So, you're getting that privilege on other schemas that you may not really need that privilege for...
Ron: So now the gap is kind of met with creating a schema-level privilege that allows you to grant the same any privilege but on all objects of a particular schema and not granted across all the schemas.
So this now allows us to much better be able to manage schemas, have schema user accounts with different level privileges on all the objects that they need to perform the type of work that they need to, without having to granularly assign each one of those privileges as we used to create many different roles with different privileges needed, then try to control the users by granting them those roles. Here, these are much better simplified by going through the schema-level privilege.
12:34
Nikita: Ron, I want to ask you about the new feature on creating audit policies at the column level.
Ron: So if you remember, in the past, we talked about we can create audit policies with the old system where you would identify what to audit. But then you had to manage a whole bunch of parameters and security. And protecting audit even from the administrator were major issues.
In 12, Oracle identified or added the unified audit, which gives you protection on the audit schema. Even administrators cannot access it. You manage it through privileges that are assigned specifically to users who are going to manage the audit.
And it also allow you to audit Oracle operations, tools like Data Pump, like RMAN. So you can create a really secure audit environment monitoring everything in the database using unified audit and then maintain and manage those audits.One of the important aspect of auditing is generating the minimal amount of audits. So this way, audits can be reviewed because if you generate too much audit, it is very hard to automate either using an automated system to review the audits or having users to review those audits.
Furthermore, if we wanted to then audit specific columns and different operation like SELECT, DML, we would have had to use the row-level security and build additional policies to be able to then individually monitor those columns, which not very simple to use and manage. And then the audits are put in different tables. Having to maintain all of those, relate them has always caused major issue overall.
So the benefit of having now this column-level audit added to the normal unified audit policies is that you can go ahead and build now your audits instead of at the table level, only for a particular column. This is going to reduce the false positive results that are generated because if I'm going to put update on a table, not updating any column can generate an audit.
But if I put update on the column salary, then only if the salary is updated, the audit is generated. So that can give me just the audits that are needed without the additional false positive audits that are generally generated.
15:08
Lois: Ron, can you talk to us about the management of authorization for Unified Audit administration, especially when using Database Vault?
Ron: So first as we know for the Unified Audit, you have audit admin privilege and audit viewer privilege.
If you want to be able to create and administer and manage all of the audit information, including the audit purging and time periods and all of that, you have to have audit admin privilege. If you want to be able to read and generate the reports or things like that from the audits that have been created, you have to have audit viewer privilege.
Now we also have Oracle Database Vault. Database Vault kind of uses a row level security, but not on the end user data. It applies this row level security and administration on Oracle data dictionary. And allows you to control when particular object can be used, at what level can they be used?
And give you complete control over how the actual database and the objects are used and become available to other users in the database, including other administrators, even schema owners. So when the Database Vault is then applied and enabled, in the past, we could have managed the Unified Audit, which was kind of very funky to put one of the major security functions outside the main security Administration utility of the database.
So now, the Unified Audit has been incorporated into the Database Vault. So you can now use Database Vault to go ahead and set up the privileges and configuration for the authorizations required for managing Unified Audit. This also controls all the high-level users, including SYS, SYSTEM, and anyone who may have DBA roles or other high-level privileges.
So this allows us to now enable the Database Vault, and then manage the authorizations for the Unified Audit through Database Vault. Therefore, all authorization administration is unified under the same security tool, which is Database Vault.17:28
Nikita: The final new feature to discuss is the integration of Microsoft Azure Active Directory with the Oracle database environment. What can you tell us about it, Ron?
Ron: This has been requested by many of the clients who use other platforms and active directories and then need to access either the Oracle OCI, Oracle Cloud where the databases are running or having Oracle databases even in a local environment.
So wanted to be able to now allow this to happen. So if you remember, originally we had capability of mapping users from the database into Oracle Active Directory. So this way the user's role privileges can be centrally managed and the user does not inherit any privileges in the database. So if the user directly connect to database, has no privileges. Connect properly through Active Directory, everything enabled.Then in Database 18, they created the commonly managed users, the CMUs. Where we could now map a third party Active Directory and then be able to use that into connecting to Oracle database for authentication and user administration. However, many of our clients use Microsoft Azure Active Directory. And they wanted to be able to integrate that particular Active Directory into Oracle environment, especially in the Oracle OCI Database as a service environment.
So to be able to do that, Oracle has multiple components that they have built to allow this to be able to now be configured and used. So the client can use these Active Directory for their user administration centrally.
19:20
Lois: With that, I think weāve covered all the new features related to database security in 23ai. Thanks so much for taking us through all of them and giving us some context.
Nikita: Yeah, itās really been so helpful. To learn more about these new features and watch some demonstrations on them, visit mylearn.oracle.com and search for the Oracle Database 23ai New Features for Administrators course. Join us next week for a discussion on some more Oracle Database 23ai new features. Until then, this is Nikita Abrahamā¦
Lois: And Lois Houston signing off!
19:54
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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Join hosts Lois Houston and Nikita Abraham, along with Senior Principal Database & Security Instructor Ron Soltani, as they dive into the critical topic of database security. In the first of a two-part series on database security in Oracle Database 23ai, they discuss the importance of protecting data against external and internal threats, common security risks like phishing and SQL injection, and the principle of least privilege. Oracle MyLearn: https://mylearn.oracle.com/ou/course/oracle-database-23ai-new-features-for-administrators/137192/207062 Oracle University Learning Community: https://education.oracle.com/ou-community LinkedIn: https://www.linkedin.com/showcase/oracle-university/ X: https://twitter.com/Oracle_Edu Special thanks to Arijit Ghosh, David Wright, and the OU Studio Team for helping us create this episode. -------------------------------------------------------- Episode Transcript:
00:00
Welcome to the Oracle University Podcast, the first stop on your cloud journey. During this series of informative podcasts, weāll bring you foundational training on the most popular Oracle technologies. Letās get started!
00:26
Nikita: Hello and welcome to the Oracle University Podcast. Iām Nikita Abraham, Principal Technical Editor with Oracle University, and joining me is Lois Houston, Director of Innovation Programs.
Lois: Hi there! In case you missed last weekās episode, weāve begun a new season of the podcast, talking about all the new features in Oracle Database 23ai. We covered blockchain tables and new features, and todayās episode is going to be one of two that will be dedicated to database security.
Nikita: Right, Lois. So, in Part 1, we want to set the scene, so to speak, by looking at an overview of database security so that when we discuss some of the new features, weāll know exactly where they actually fit into the process. Joining us for these two episodes is Ron Soltani. Ron is a Senior Principal Database & Security Instructor with Oracle University.
01:16
Lois: Hi Ron! Thanks for being with us today. To start off, let's discuss the importance of database security. Why is database security so critical today?
Ron: Security requirements, describes the need for keeping things private and make sure that we protect against threat, against data destruction. We also have, today, data that is global. Therefore, there is consolidation of the data. There is globalization.
There is data sourcing, locational, where the data is actually located, rules opposed by different governments, and guidelines that enforce a certain type of security administration on the data. And finally, there are many different companies or organizations that actually come up with either guidelines or rules that must be followed for security aspect that we must set up and build compliance.
02:24
Nikita: Ron, what are some of the common security risks that databases face?
Ron: Security risk can include external threats that could be unauthorized users trying to use phishing, get privileged user information, and get in as a privileged user to do whatever damage they want. Denial-of-service attack, one of the most common attacks out there where the attackers just create or attack the components, like a listener, for example, in a database, and cause a situation where the listener can no longer establish connection to the database. So now no client can connect to the database to get data, which is that denial-of-service attacks.
Having unauthorized access to the data-- so again, this is generally done through phishing or sometimes even SQL injection. SQL injection also allows you to insert SQL statement in the application where it's not expected, where it can then convert into an executable in the database and then have unwanted data returned for the user.
03:42
Nikita: Sorry, can you explain that?
Ron: For example, when you go to Google, you want to run a search. They expect you to say, meaning of a particular word.
Now, what if I knew the structure of the data organization in Google? And instead of just putting in meaning of whatever word, I actually plug in a SQL statement that then passed along to the Google system to be executed. And then that SQL, if the components and everything exist and within the privileges of what is being executed, could expose some information to me. So that's the idea with being able to perform that type of operation.04:24
Lois: Ok. So, those are external threats. But, could you also have internal threats?
Ron: Internal threat could be abused by someone who is privileged, could be sabotage of the system and the data. It could be data complexity that creates an environment where data is not properly being secured and even accidental damage. It's a security issue.
And then finally, if there is a damage, we do need to be able to perform recovery. So we create backups and data access in those. Therefore, those recovery information must be properly secured. And finally, the omission, being able to block access or cause issues with the data. Then having external threats coming in through the internal abuse, so internal abuse could actually open door to allow external threats to get in.
Now, the final type of security risk could be coming in from partners who have privilege to be able to load or access and get data. For example, I may sell a particular product. But the product description is actually coming from the product distributor.
05:47
Nikita: Yeah, so they have access to push that product information into your system. So, what are the typical points of attack for a database? Iām familiar with phishing.
Ron: People send you emails or do something to be able to get information from the pieces and things that come back. For example, this is one of the reason for many operation. We would return false error messages. Like in Oracle database, if you don't have privilege on the table and you try to select it, we tell you a table or a view does not exist. So this way, you don't know if it's a table, you don't know if it's a view. And as far as you know, it doesn't exist. So the name you have does not correspond to any particular data.
06:32
Nikita: Thatās clever!
Ron: If we would tell you don't have privilege, now you know the name of this table exists. So now I just got to find a way of hacking the table. So this is basically phishing means, extracting different pieces of information through different channels, being able to put them together.
Then in database, we have some privilege known accounts that if not protected can be a vulnerable access. The back doors into the database. For example, somebody being able to get to the operating system DBA group, and then connect to the database without user ID and password.
That's why we have to protect every layer. Any debug codes that may be available that could reference how the operation of the system is actually going. Creating cross-scripting between the different data and then operations that goes on. And as we talked about, SQL injection.
07:28
Lois: Can you dive a little deeper into SQL injection, Ron?
Ron: With SQL injection, you kind of have to understand that, in general, SQL injection means somebody, like we said, knows the structure of something, knows the structure of the way the application is operating, and then be able to inject a SQL statement where they would generally put a condition or pass some parameters or some information to the application.
So, then that SQL statement becomes part of that statement and submitted to the database. Now, we need to understand SQL injection is not about the person, is not about generally your overall configuration of the database.The most important aspect of SQL injection is about the session that is actually doing the work. For example, if I am a DBA and I am going to collect statistics for a table. If I connect a SYS DBA to collect that statistics and somebody hacks into my session and inject a SQL drop database. Database gone, because the session has SYS DBA privilege.
But if I have a user that only has create session privilege and execute a script. And in this script, I write the statement to collect statistics and I give that script only the privilege to collect stats. So now I can connect as that user with that minimal privilege, just execute the script.
So now anyone inject any SQL into the session, that will never be executed because the session has no privilege. So this is the important of SQL injection for us to understand that the importance is what happens at the session level.
And many of the security element we will see, like read-only session, hybrid read-only PDB and things like that are related into this type of SQL injection or abuse.
09:30
Lois: Yeah, we are looking forward to talking through those new features in the next episode.
Ron: So the common vulnerabilities can be exploited, and also any of the users that are part of the operations that can be set up into the string and supplied into middle of statements and things like that.
09:56
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10:25
Nikita: Welcome back! One of the concepts I wanted to ask you about, Ron, is the principle of least privilege. Can you explain what it really means?
Ron: Principles of least privilege, again, means the work that needs to be done has to have minimal privilege.
10:40
Nikita: But, weāve always thought about that, right? Giving a user minimal privilegesā¦
Ron: Well, back in the old days, we used to execute everything as a schema owner.
Therefore, we had privilege on all the data. Then we said, OK, let's create schema users and only give them like a read privilege or this privilege. So they can only do the type of work they need to do, which is fine.
But at the same time, that can be very complex. Now I need a lot of different users and whatnot. So when it comes to principles of least privilege, this is generally about only installing whatever software that is required. Only enable or turn on whatever machines and segments that is going to be used.
Have proper operating system level users and privileges configured for all of the software that is installed at the operating system level. Have proper administrator account that are properly maintained. Set up privilege user account for each operation.
So when we do maintenance and database administration, we are not creating very high-level privileged session. That's why some of the differences privileges was created in database 12 and up, like Sys backup, Sys DG, Sys RAC. So you don't inherit the privilege as Sys DBA to actually do the work. You only have privileges for what you need.
And, of course, limit the user's access to particular object and things that they need to do. However, as I mentioned, this is not just about the user level. This is also about the session level. If I'm going to do maintenance and I'm connecting as a schema owner, somebody inject a SQL drop table, table gone. So that's why it is very important for us to be able to have control over how sessions can also operate within the database.
12:34
Lois: Right, so, what about the strategy of defense in depth?
Ron: Defense in depth. That means we have to strengthen and apply security at every level, whether it being at the securities applied at the operating system in the database, in the application, in the network.
So we have to have policies defining all the different security levels. Most important, train users. So no mistakable damages. Harden every component, including the operating system. Set up proper firewalls.
Set up proper network security, like use of the Oracle firewall that protects against unwanted SQL statements. We can compare SQL statement to a whitelist of acceptable statements. And then other database security features like VPD, the auditing as we will talk about, and other components to give you an overall very secure environment.
13:35
Nikita: Ron, what are the fundamental aspects of managing security only within the databaseā¦ not including the operating system or the application?
Ron: So first, we have to have confidentiality. Confidentiality means that we need to make sure that all of the data is properly secured at a data level, whether it be both at the storage level, in the database for data usage, and we have many different ways of doing confidentiality management.
Number one, properly creating users, maintaining users with the proper password through proper authentication. And then setting up authorization that privileges may not be enough because if I give you select privilege, you can see every column, every row.
So I may need row level security, data redaction, data masking for duplication, and other mechanism to help us manage even subset of data for that particular security.
14:35
Lois: Okā¦ so thatās confidentiality. Whatās next?
Ron: Data integrity means that we need to make sure that data is not destroyed, whether it being addressed in the database, in memory, in data file, in backup, in exports, or during transmission in the network.
So we usually apply encryption and check-summing not only to protect the data, but also to validate, make sure it's not corrupted.
Next data availability, which means today, especially, we are 24/7 operation. And remember we talked about denial of service attack on a database. That usually attacks on the listener, because if the listener is crashed, nobody can connect.
We have to then utilize available tools and components like RAC to have multiple instances in case a particular host crashes. And I lose a particular instance. Data Guard in case my storage and a whole database crashes. The PDB and real-time PDB management with duplication, having a PDB standbys that are maintained and managed behind the scene. Using PDB snapshots, which are point in time. Preserve data that I can use it for restoring data at those particular point in time.
Backup recovery through RMAN or other backup recovery processes. So in case data is damaged, I can restore it and recover it. And finally, auditing. Auditing historically was always known as after effect.16:09
Nikita: Thatās what I was wonderingā¦ You only see whatās going on after something happens, right?
Ron: It also can be a deterrent when people know they are being audited, they're more careful, don't make mistakes. Try not to, of course, do anything you get caught. And today, this auditing can also be set up in a way that it cannot only catch what is going on. It can actually help us better secure data and have much better responses.
Now the problem with auditing has always been the overhead. That's why the unified audits that provides us with much less overhead for management can give us an extreme detailed audits. And then the new features allows us to even more reduce the amount of audits that are generated by only auditing at the column level and better protection for those audits.
By the way, in the older days, most auditing was done at the app, because we never knew who the end user the app is. But today with being able to have Active Directory mapped into the database and information passed between the two, all audits can actually come back centrally to the database.17:21
Lois: So, to wrap up todayās conversation, Ron, can you just summarize database security for us? All the things we need to think about.
Ron: So database security starts with making sure, number one, our network is secure and we are accessing the data through a very secure connection coming in from the user.
If required to be, could have a three-tier environment where the clients go through a first external firewall to get to the middle tier. Then from the middle tier go through internal firewall to get to the database, or if this is like a direct access and things like that, setting up secure network coming in through that like for administration, remote administrations, and operations.
Then, setting up proper authentication and authentication management, configuring detail, access control and setting up multiple level of security for data accesses, not just at the table level, even at the row and column level.
And building a complete data confidentiality by not only adding in storage encryption and all of the management of the data, even on components sitting outside the database, of course, we have Oracle components that can manage some of those for you, like sample backups, RMAN, and things like that.
And to get this complete data confidentiality, you also add in, as we said, an efficient auditing that can then describe any issues, tell us where the problem is, how it happened. And if we set up an audit system that is very focused, then we can even tie it up to triggers, to notifications.
So they're very quickly responded to, because the problem with audits has always been there is just way too much of them, therefore nobody ever reviews them to see exactly what has happened. So many vulnerabilities may go on detected until a major damage happens.
And that's how you can know that this is common out there in a lot of businesses when you hear in the news. And so and so company was broken in and so much data was stolen. Well, if proper security were set up and the network is being hacked in and proper alert system and automated system were configured to be able to catch these in a proper auditing real-time, then maybe corrective action could have stopped a lot of those damages.
20:04
Nikita: Thanks for that wonderful overview, Ron. In our next episode, weāre going to go through each of the new security features and try to understand how Oracle is tightening the screws around security.
Lois: And if you want to learn more about what we discussed today, visit mylearn.oracle.com and search for the Oracle Database 23ai New Features for Administrators course. Until next week, this is Lois Houstonā¦
Nikita: And Nikita Abraham signing off!
20:31
Thatās all for this episode of the Oracle University Podcast. If you enjoyed listening, please click Subscribe to get all the latest episodes. Weād also love it if you would take a moment to rate and review us on your podcast app. See you again on the next episode of the Oracle University Podcast.
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