Re: latch

Hi!

Shared pool latch protects memory allocation and de-allocation in shared pool. Thus probably you have a very volatile shared pool currently. You have several options, first of them would be to check whether you'r application is using bind variables. If it is mostly using literal values in SQL, then each sql call with different parameters has to be parsed and stored in library cache along with it's execution plan etc.. Maybe you have too *big* shared pool? I'm not sure about 9i, but in 8i you could have a lot of shared pool LRU scanning for recreatable chunks when loading/parsing in a new object.

If literal values in SQL are your case, then either change the app or use cursor_sharing = force parameter. Check www.ixora.com.au Q+A section under shared pool, there is more information about shared pool tuning.

Tanel.
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Monday, July 28, 2003 8:34 PM

> can someone please tell me what is shared pool
> latch(latch# 155) and how do we prevent this.
>
> i am facing this in 9i very frequently.
>
> thanks
> sai
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
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Author: Tanel Poder
  INET: tanel.poder.003_at_mail.ee

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