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Automatic Degree of Parallelism in 11.2.0.2 (Doc ID 1269321.1)

Last updated on AUGUST 14, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.2 to 11.2.0.4 [Release 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.

Purpose

In 11.2.0.2 Automatic Degree of Parallelism can only be used if  I/O statistics are gathered.

This Note explains what DBA has to do in order to make sure Automatic Degree of Parallelism works.

Scope

For DBAs 

The AutoDOP is not a feature to use more parallelism. It is a feature that restricts the parallel to maximize throughput,
so it is expected that with AutoDOP not all queries will run in parallel and the ones that do run in parallel may not run with full parallelism, as this is the technical specifications of the feature.

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In this Document
Purpose
Scope
 Ask Questions, Get Help, And Share Your Experiences With This Article
Details
 IO Calibration
 Tuning Parameters
References

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