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Database Slow After Upgrading Asm to 11.2 Oracle Restart ( 'KFMD SGA' 'latch free' 'CSS operation: query' ) (Doc ID 1444483.1)

Last updated on JANUARY 29, 2022

Applies to:

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


After upgrading the ASM to 11.2 GI Oracle Restart, you are seeing slow performance on the database side.

The database side symptoms could be anything like

+ enq: HW - contention
+ latch free ( KFMD SGA )
+ 'enq: TX - index contention'
+ slowness in LOB updates
+ 'CSS operation: query'

Further analysis shows contention is at the CSS layer, and you see the following two important symptoms:

1] The local.ocr file size is zero at <GI Home>/cdata/localhost/ directory

Number of such css log files would be in hundreds or thousands




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