Oracle-L: RE: Tuning Large Pool

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Thu, 30 Jan 2003 19:38:44 -0800
Message-ID: <F001.0053FFF2.20030130193844@fatcity.com>

Tc - I haven't played with these parameters, so I can only offer some ideas based on the documentation, and maybe someone who has tested this will respond.

It looks like if you set PARALLEL_AUTOMATIC_TUNING and leave the LARGE_POOL_SIZE unset, then Oracle will calculate the large pool size for you. Maybe Oracle thinks you have set LARGE_POOL_SIZE too low and it is providing a higher value. One test you could perform would be to comment LARGE_POOL_SIZE out and see if you receive the same value.

Now, as to Oracle dynamically reducing the LARGE_POOL_SIZE, I don't see any hint that this will occur. Have you seen this mentioned somewhere?

Dennis Williams
DBA, 40%OCP
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Thursday, January 30, 2003 8:22 PM To: Multiple recipients of list ORACLE-L

Dennis,

Its 9i release 9.0.1.1.1 on Windows 2000. Heres the query & output

SQL> select name,round(bytes/(1024*1024),1) from v$sgastat where pool='large pool';
Enter ...

NAME                       ROUND(BYTES/(1024*1024),1)
-------------------------- --------------------------
free memory                                    4095.9
PX msg pool                                        .1

Elapsed: 00:00:00.07
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Author: DENNIS WILLIAMS
INET: DWILLIAMS_at_LIFETOUCH.COM

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