RE: Tracking Temp Segment Usage and Event 10046

From: STEVE OLLIG <sollig_at_lifetouch.com>
Date: Wed, 18 Sep 2002 07:58:25 -0800
Message-ID: <F001.004D25FD.20020918075825@fatcity.com>

aren't Cartesian joins are unlikely since all was well in the RBO world? sounds to me like the RBO was simply selecting better query plans than the CBO is.

Raj - have you tried playing around with the OPTIMIZER_MODE parameter or OPTIMIZER_INDEX_CACHING; and OPTIMIZER_INDEX_COST_ADJ as described in Tim Gorman's paper?
http://www.evdbt.com/SearchIntelligenceCBO.doc <http://www.evdbt.com/SearchIntelligenceCBO.doc>

-----Original Message-----
Sent: Wednesday, September 18, 2002 10:03 AM To: Multiple recipients of list ORACLE-L

I'd start looking at the execution plans first and examine if there is any Cartesian joins and the order the tables get joined.

Waleed

-----Original Message-----
Sent: Tuesday, September 17, 2002 10:34 AM To: Multiple recipients of list ORACLE-L

I have a problem with a process and its temp segment usage.

Previously, in RBO (8161) we used to run 8 reports with slightly different parameters in parallel and it used to work fine with all other load on the system and the total TEMP space was 6GB

Since we migrated to CBO (all tables & indexes are analyzed using estimate), these processes fail with unable to extent temp segment error. Currently we have allocated 12GB to temp tablespace.

I also have performance issues so I am doing a 10046 trace at level 8 on this one. Is there a way to identify when this process used temp space, how much and when does it de-allocate?

Would this information be available in 10046 trace or is there something else that I could do to track that ...

Thanks in advance
Raj

Rajendra Jamadagni MIS, ESPN Inc. Rajendra dot Jamadagni at ESPN dot com
Any opinion expressed here is personal and doesn't reflect that of ESPN Inc.

QOTD: Any clod can have facts, but having an opinion is an art!

--

Please see the official ORACLE-L FAQ: http://www.orafaq.com
--

Author: STEVE OLLIG
INET: sollig_at_lifetouch.com

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: ListGuru_at_fatcity.com (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). Received on Wed Sep 18 2002 - 10:58:25 CDT