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

Last updated on OCTOBER 31, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.3 and later
Information in this document applies to any platform.
***Checked for relevance on 09-Jul-2014***

Symptoms

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

ls -ltr
-rw-r----- 1 grid oinstall 0 Mar 18 03:46 local.ocr


2] There are a lot of css<N>.log file at <RDBMS Home>/log/<hostname>/client/* directory.

ls -l <RDBMS Home>/log/<Hostname>/client/*
-rw-r--r-- 1 oracle oasmadm 1362 Mar 18 05:15 ./css.log
-rw-r--r-- 1 oracle oasmadm 1362 Mar 18 05:15 ./css1.log
-rw-r--r-- 1 oracle oasmadm 1362 Mar 18 07:03 ./css10.log
-rw-r--r-- 1 oracle oasmadm 1362 Mar 18 10:52 ./css100.log
-rw-r--r-- 1 oracle oasmadm 1362 Mar 18 19:24 ./css1000.log
-rw-r--r-- 1 oracle oasmadm 1362 Mar 19 12:22 ./css10000.log
-rw-r--r-- 1 oracle oasmadm 1362 Mar 19 12:22 ./css10001.log
-rw-r--r-- 1 oracle oasmadm 1362 Mar 19 12:23 ./css10002.log
-rw-r--r-- 1 oracle oasmadm 1362 Mar 19 12:23 ./css10003.log
-rw-r--r-- 1 oracle oasmadm 1362 Mar 19 12:23 ./css10004.log
::::::::::::::::



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

Cause

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