RE: Help with Shared Pool Problem

Thanks Mark.

-----Original Message-----
From: Bobak, Mark [mailto:Mark.Bobak_at_il.proquest.com]=20 Sent: Thursday, October 14, 2004 9:11 AM To: Smith, Ron L.; Ganesh Raja
Cc: shaharul.anuar_at_intecbilling.com; oracle-l_at_freelists.org Subject: RE: Help with Shared Pool Problem

Ron,

I have to disagree w/ Ganesh. A SQL, once execution completes, should be=20
eligible for flushing, unless it was kept. You don't have something running that would keep existing cursors into the library cache, do you? I would tend to doubt that you do, but, if you did, that would certainly cause problems.

I think you want to go here: http://www.ixora.com.au/scripts/pool.htm and review some of the scripts, expecially shared_pool_lru_stats.sql, shared_pool_free_lists.sql, and shared_pool_summary.sql

Steve covers what these scripts do, but, briefly, the summary shows you what kinds of objects are taking space in the shared pool. The free_lists script shows you how fragmented the free lists are, (which can lead to ORA-4031) and finally, the lru_stats script can give you some idea of whether your shared pool is undersized.

Check the website and Steve's book for more details as to how it all works and how to interpret the outputs of these scripts,=20 especially the lru_stats script.

Hope that helps,

-Mark

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Smith, Ron L. Sent: Thursday, October 14, 2004 9:48 AM To: Ganesh Raja
Cc: shaharul.anuar_at_intecbilling.com; oracle-l_at_freelists.org Subject: RE: Help with Shared Pool Problem

So you are saying there is no LRU processing taking place? Nothing is ever aged out or overwritten?

Ron

-----Original Message-----
From: Ganesh Raja [mailto:ganesh.raja_at_gmail.com]=3D20 Sent: Thursday, October 14, 2004 8:33 AM To: Smith, Ron L.
Cc: shaharul.anuar_at_intecbilling.com; oracle-l_at_freelists.org Subject: Re: Help with Shared Pool Problem

There is No Aging happening .. Let us assume that u are Calling a Select Stmt Again and Again with different Parameters to it and also same parameters .. As Far as Oracle is concerened your stmts have not aged . They are new since it has now only been created or it has been used in the past few mins.

So oracle tries to create new space for the stmt that u are trying to parse now and it fails there ..

HTH ~
Ganesh

On Thu, 14 Oct 2004 08:08:35 -0500, Smith, Ron L. <rlsmith_at_kmg.com> wrote:
> I know the reason for the Shared pool filling up is because the=3D20 =20
>programs do not use bind variables. =3D20
> My question was, why do the old SQL statements not get aged out =
and=3D20
> free up space for new statements?
>=3D20
> Ron
>=3D20
> -----Original Message-----
> From: shaharul.anuar_at_intecbilling.com=3D20
> [mailto:shaharul.anuar_at_intecbilling.com]=3D3D20
> Sent: Thursday, October 14, 2004 8:06 AM
> To: Smith, Ron L.; oracle-l-bounce_at_freelists.org;=3D20
> oracle-l_at_freelists.org
> Subject: RE: Help with Shared Pool Problem
>=3D20
>=3D20
> Hi Ron,
>=3D20
> Have u ran SQL trace on particular session doing large data load?=3D20
> Looks like that piece of SQL is not using bind variables. If no
bind=3D20
> values, same SQL will be treated as new piece of code and has to =
be=3D20
> hard parsed each time.
>=3D20
> Shaharul
>=3D20
>=3D20
> -----Original Message-----
> From: oracle-l-bounce_at_freelists.org
> To: oracle-l_at_freelists.org
> Sent: 10/14/2004 1:55 PM
> Subject: Help with Shared Pool Problem
>=3D20
> Can someone tell me why I keep running out of shared pool space?
If=3D20
> old SQL statements are supposed to be aged out or written over=3D20
> automatically, how can I run out of space? This is happening =
from=3D20
> time to time in several databases. It appears it happens when
large=3D20
> data loads are running.
>=3D20
> Ron
>=3D20
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