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High "gc buffer busy acquire" wait after Upgrade to 11.2 (Doc ID 2047582.1)

Last updated on DECEMBER 20, 2022

Applies to:

Oracle Database Cloud Service - Version N/A and later
Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Generic Linux


After a database was migrated (using export/import) from a RAC cluster to a new cluster with Grid Infrastructure and RDBMS, customer observed "gc buffer busy acquire" as the top wait event whenever the load increased significantly.

This behaviour was not observed in the "old" 10.2 environment, there was no change neither in the data (amount) nor in the application.

AWR report from instance 1 shows the following during times of high load:




 Upgraded a database from a 10.2 cluster to a 11.2 new cluster


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