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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 24, 2020

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.
***Checked for relevance on 09-Jul-2014***


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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