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ORA-4031 Due To Large 'GCS RESOURCES' And 'GCS SHADOWS' (Doc ID 844879.1)

Last updated on JANUARY 29, 2022

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.


An ORA-4031 occurred under heavy load on RAC with large buffer cache size. Heapdump and v$sgastat showed that 'gcs resources' and 'gcs shadows' area used large portion of shared pool.

How to estimate 'gcs resources' and 'gcs shadows' sizes in Shared Pool on RAC?
How to prevent ORA-4031 due to 'gcs resources' and 'gcs shadows' ?


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