High "gc buffer busy acquire" wait after Upgrade to 11.2

(Doc ID 2047582.1)

Last updated on MAY 16, 2018

Applies to:

Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.


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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