RE: RE: question about large pool

>From the doc:

LARGE_POOL_SIZE lets you specify the size (in bytes) of the large pool allocation heap. The large pool allocation heap is used in shared server systems for session memory, by parallel execution for message buffers, and by backup processes for disk I/O buffers. (Parallel execution allocates buffers out of the large pool only when PARALLEL_AUTOMATIC_TUNING is set to true.)

Waleed

-----Original Message-----
Sent: Monday, June 02, 2003 4:35 PM
To: Multiple recipients of list ORACLE-L

for some reason we have 100MB large pool. I dont think we need it at all. I read that its only used by RMAN or Parallel server. Is that accurate?
>
> From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
> Date: 2003/06/02 Mon PM 03:39:42 EDT
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Subject: RE: question about large pool
>
> Use the large pool to store what? I can think of 3 aspects of a
transaction:
> - Rollback (you've probably read about SET TRANSACTION)
> - SQL statements, execution plans (more an issue with bind variables)
> - Data blocks
> It sounds like you might be thinking of data blocks. You didn't mention
your
> Oracle version, but from 8i on you can define 3 buffer pools. The normal
one
> is DEFAULT. You can also define a KEEP and RECYCLE pool. Someone on this
> list (sorry I can't recall who) pointed out that there isn't anything
magic
> about those labels. If your transaction uses different tables from the
other
> transactions, you could create what is needed for those tables in one of
> those pools, assign the tables to that pool, and this would minimize the
> interference. If all the transactions hit pretty much the same tables,
then
> Oracle is probably reusing the blocks anyway. Hope this responds to your
> question.
>
> Dennis Williams
> DBA, 80%OCP, 100% DBA
> Lifetouch, Inc.
> dwilliams_at_lifetouch.com
>
>
> -----Original Message-----
> Sent: Monday, June 02, 2003 1:40 PM
> To: Multiple recipients of list ORACLE-L
>
>
> I think I read this somewhere, but I cant find it. Is it possible to use
the
> large pool for a specific transaction? We run alot of large batch DML
> statements over night. We have one that involves an 8GB table. The blocks
> from this table are being knocked out of the buffer cache by shorter and
> quicker batches.
>
> Id like to find to store this transaction in memory without having to
worry
> about them getting knocked out of memory.
> Cache wont do it. It will stick get pushed out.
>
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> Author: <rgaffuri_at_cox.net
> INET: rgaffuri_at_cox.net
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  INET: rgaffuri_at_cox.net

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