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Things to Consider to Avoid SQL Plan Management (SPM) Related Problems on 19c (Doc ID 2774029.1)

Last updated on JULY 23, 2024

Applies to:

Oracle Database - Enterprise Edition - Version 19.0.0.0 to 19.14.0.0.0 [Release 19]
Oracle Database Cloud Exadata Service
Oracle Cloud Infrastructure - Exadata Cloud Service
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine)
Gen 2 Exadata Cloud at Customer
Information in this document applies to any platform.

Purpose

The purpose of this document is to publish some recommended fixes in hopes of avoiding problems related to Plan Stability options including SQL Plan Management, SQL Profiles & SQL Patches.

For SQL Performance, refer the below document.

<Document 2773715.1> Things to Consider to Avoid SQL Performance Problems on 19c

For Query Wrong Results, refer the below document.

<Document 2606585.1> Things to Consider to Avoid Prominent Wrong Result Problems on 19C Proactively

Scope

This document contain the list of some known bugs impacting the SQL Plan Management (SPM) and other plan stability options. Some of them are included to DBRU already but some are not yet.

REMEMBER: Database Release Updates (RU) are cumulative in nature. For example, the Apr 2021 Release Update patch includes the contents of all previously Release Updates. Hence, it is always RECOMMENDED to be in the latest DBRU (Database Release Update) that contains most of the known bug fixes.

<Patch 3441943> - Database Oct 2022 Release Update (19.17) - Latest

Refer the below document for the latest DBRU information.

<Document 2521164.1> Oracle Database 19c Proactive Patch Information

For bugs that are not included to RU yet, please download and install one-off patch for your database version and OS. If you do not find a patch for your specific version and OS from MOS, please open a Service Request with details on the patch needed. Please include a list of patches already applied (opatch lsinventory -detail) as well as any other patches you intend to apply.

Some of the Optimizer bug fixes (not all) are controlled by _FIX_CONTROL setting and are DISABLED by default in 19c when installed either through one-off backport or through RUs. For one-off patches, please refer to the corresponding Patch Readme carefully and enable the fix control if applicable in order to activate the fix.

Example:

 

Details

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