In 8i LARGE_POOL_SIZE defaulted to 18M if not set when using P_A_T. I have not yet tried this in 9i, though. But, if P_A_T is set to true, it affects a number of other parameters. Check Oracle9i Data Warehousing Guide. There is a chapter (#21) on Parallel Execution. And there is a formula to compute LARGE_POOL_SIZE using PARALLEL_EXECUTION_POOL plus other geeky stuff... :)
The catch is they don't explain how PARALLEL_EXECUTION_POOL is computed. Doesn't it sound like an init.ora parameter? but it is not). In one of the Metalink forum threads, there is a reference to review other related parameters as described in that chapter to establish resource limits for Parallel Operations. So, this is a new term manufactured by Oracle to keep us guessing. I would not set LARGE_POOL_SIZE to any value if I used P_A_T. Let Oracle figure it out. One can always check what values Oracle derives for other parameters... I don't think LARGE_POOL_SIZE will shrink once it gets allocated. Shrinking memory dynamically is an expensive operation. HTH, - Kirti -----Original Message----- Sent: Thursday, January 30, 2003 9:39 PM To: Multiple recipients of list ORACLE-L 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. [EMAIL PROTECTED] -----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 -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: INET: [EMAIL PROTECTED] -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Deshpande, Kirti INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).