Changes in This Release for Oracle Database Performance Tuning Guide

This preface contains:

Changes in Oracle Database Release 21c, Version 21.1

The following are changes in Oracle Database Performance Tuning Guide for Oracle Database release 21c, version 21.1.

New Features

The following features are new in this release:

  • Auto-Result Cache, settings to determine eligible queries for storing the result sets in the server and client result caches.

  • Directly Mapped Buffer Cache Support

  • In-Memory Hybrid Scans

Note:

A multitenant container database is the only supported architecture in Oracle Database 20c. While the documentation is being revised, legacy terminology may persist. In most cases, "database" and "non-CDB" refer to a CDB or PDB, depending on context. In some contexts, such as upgrades, "non-CDB" refers to a non-CDB from a previous release.

Desupported Features

Note:

A multitenant container database is the only supported architecture in Oracle Database 20c. While the documentation is being revised, legacy terminology may persist. In most cases, "database" and "non-CDB" refer to a CDB or PDB, depending on context. In some contexts, such as upgrades, "non-CDB" refers to a non-CDB from a previous release.