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High CPU Usage when NUMA enabled (Doc ID 953733.1)

Last updated on JANUARY 30, 2022

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 10.2 to 11.1]
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.


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.


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


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