Oracle-L: Re: latch free

From: Dilip <dilip7772002_at_indiatimes.com>
Date: Thu, 15 May 2003 03:21:38 -0800
Message-ID: <F001.00599696.20030515032138@fatcity.com>

CPU utilization was 100 % on the server. In fact we were looking at the top command. From that came to know about one very long running oracle process. Then traced that process to this perticular problem.

~Dilip

ORACLE-L_at_fatcity.com wrote:

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
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Author: Khedr, Waleed
INET: Waleed.Khedr_at_FMR.COM

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Author: Dilip
INET: dilip7772002_at_indiatimes.com

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Re: latch free - library cache