RE: latch free - library cache

CURSOR_SHARING=FORCE is used to FORCE binding variables... Your application is not using bind variables where it should do. Now depends if you application is an OLTP then bind variables are highly recommended.
If you application is DSS then you don't need to use bind variables as it won't HELP...and for this, those Oracle guys need to explain why....

Regis

-----Original Message-----
Sent: Thursday, May 15, 2003 12:07 PM
To: Multiple recipients of list ORACLE-L

>From the init.ora found out that CURSOR_SHARING=FORCE was done by oracle people who had visited site for performance problems in Sep 2002.

Now I have to catch them (if that is possible !!!) and ask the reason behind keeping it FORCE.

~Dilip  

ORACLE-L_at_fatcity.com wrote:

WHOA!!! Why do you have CURSOR_SHARING set to FORCE (default = EXACT)? You ain't supposed to do that with Oracle 11.5.x! Certainly not with 817x. Check out MetaLink doc #216205.1...

Better yet, search MetaLink on the keyword CURSOR_SHARING and be sure to click on "Advanced" and "Bug Database"; good way to lose any enthusiasm for that particular parameter...

on 5/14/03 3:36 AM, Dilip at dilip7772002_at_indiatimes.com wrote:

> 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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