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Autonomous

Oracle 19c: Adventures with Automatic Indexing

The video of this recent presentation, given as a part of the Oracle Groundbreakers EMEA Tour 2020, is now available.

Automatic Indexing is one of the much-heralded features of Oracle 19c, but it is only available on Engineered Systems, therefore in Autonomous Database that is built on Exadata and on other Exadata platforms. This presentation shares some initial experiences with the feature based on testing it in conjunction with Swingbench and discusses how well it performed.

Oracle 19c: Real-Time Statistics & High-Frequency Statistics Collection

The video of this recent presentation, given as a part of the Oracle Groundbreakers EMEA Tour 2020, is now available.

Keeping object statistics up to date is critical to Oracle database performance and stability. Both of these features aim to address the challenge of using data that has been significantly updated before the statistics maintenance window has run again. The features are only available on engineered systems, and so certainly are targetted at the autonomous database.

When can I use SQL Macros?

One of the very cool features we’ve been talking about for 20c is SQL Macros. But you no longer need to wait for a future release of the database to get access to all the goodness of SQL Macros.

Why? Because much of the functionality has now been backported to 19c, and is also now officially in the documentation so there’s no ambiguity as to whether you are supported to use them or not. They’ll be coming soon to an RU near you </p />
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How to control resource usage on Autonomous

When you connect to your Autonomous Database, you get to choose from some predefined services. The services available depends on whether you are using a transaction processing (ATP) or a data warehouse instance (ADW) of the database, but for example, for an ATP database you get the following:

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Note: This is a screen of the docs as of time of writing this post. Over time, that may change so always be sure to consult the docs directly in future.

A Serverless Standby Database called Oracle Autonomous Data Guard

By Franck Pachot

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Announced by Larry Ellison last week, here it is: the Autonomous Data Guard. You can try it, unfortunately not on the Free Tier.
First you create an Autonomous Database (ATP or ADW) and then you enable Autonomous Data Guard.

Upgrading…Its Time!

Gough Whitlam was an Australian politician who rose to power in the 1970s with the campaign slogan “It’s Time!”. Politics aside, it loosely ran on the premise that not to have the occasional dramatic change ultimately leads to stagnation in social and economic progress.

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Oracle Autonomous Linux: cron’d ksplice and yum updates

By Franck Pachot

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Oracle Enterprise Linux (OEL) is a Linux distribution which is binary compatible with Red Hat Enterprise Linux (RHEL). However, unlike RHEL, OEL is open source, free to download, free to use, free to distribute, free to update and gets free bug fixes. And there are more frequent updates in OEL than in CentOS, the free base of RHEL. You can pay a subscription for additional support and features (like Ksplice or Dtrace) in OEL. It can run the same kernel as RHEL but also provides, still for free, the ‘unbreakable kernel’ (UEK) which is still compatible with RHEL but enhanced with optimizations, recommended especially when running Oracle products.

Consumer Group Mapping Rules Use Pattern Matching from 12.1

I recently noticed a small, but I think significant, change in the way consumer group mapping rules behave from Oracle 11.2.04.  Session attributes can be matched to resource groups using LIKE expressions and simple regular expressions specified in the matching rules, though only for certain attributes.
(Updated 12.11.2019) I am grateful to Mikhail Velikikh for his comment.  It depends on which version of Oracle's documentation for 11.2 you read.  Pattern matching does work in 11.2.0.4 for the attributes listed in the 12.1 documentation. My testing indicates that pattern matching does not happen in 11.2.0.3.
You cannot pattern match the SERVICE_NAME in 11.2.  The attribute value is validated against the list of valid services.