High CPU Usage when NUMA enabled

(Doc ID 953733.1)

Last updated on NOVEMBER 28, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.1 to 11.1.0.7 [Release 10.2 to 11.1]
Information in this document applies to any platform.
***Checked for relevance on 25-Apr-2012***

Symptoms

High CPU usage detected on load after the database was upgraded.
This symptom can be seen for example running jobs, with shared servers processes, or with some other heavy database workload.
There are several CPUs on the server. They are not uniformly loaded, some CPUs are very busy while other CPUs are almost idle.

Changes

The database has been upgraded from RDBMS version < 10g R2.
NUMA (Non Uniform Memory Architecture) has been enabled.

Cause

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