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RE: latch free - library cache

From: Khedr, Waleed <Waleed.Khedr_at_FMR.COM>
Date: Wed, 14 May 2003 08:31:38 -0800
Message-ID: <F001.0059893D.20030514083138@fatcity.com>


What is the cpu utilization of the server?

Waleed

-----Original Message-----
Sent: Wednesday, May 14, 2003 6:37 AM
To: Multiple recipients of list ORACLE-L

Hi List,

DB 8.1.7.4.0 on Sun sparc solaris 2.6
This is oracle applications 11.5.4

One of the program was running for very long time. So checked out v$session_wait for that perticular session. It was waiting on 'latch free' and from P2 column and v$latch, found out that it is waiting for library cache latch.
Now docs says this is related to shared pool fragmentation. So checked v$sgastat where it showed 38M space free in the shared pool (Total shared pool is 800 MB). But it didnt throw ORA-4031 and the process was running for last 17 hours. I looked at v$librarycache and v$latchholder but didn't get any clue.
At last, I flushed the shared pool but still that session was waiting on same wait event. Finally I had to kill the session. I am facing this situation once or twice in production and everytime I can't kill the session.

Can somebody tell me how should I debug furthur and go to the root cause of the problem. Does this mean I need to increse the shared pool ? CURSOR_SHARING is kept to FORCE.

Thanks,
~Dilip    

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Author: Dilip
  INET: dilip7772002_at_indiatimes.com

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Author: Khedr, Waleed
  INET: Waleed.Khedr_at_FMR.COM
Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
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