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RE: CBO question ?

From: Andem, Venu <Venu.Andem_at_landregistry.gsi.gov.uk>
Date: Thu, 2 Mar 2006 16:37:25 -0000
Message-ID: <D1ED0FEB56A2F643B3FC7AEA64D662044DD9B3@EH-EXC-D05.diti.lr.net>


You will have to look into DBA_TABLES (LAST_ANALYZED column), i would want to point you to the exact location where you can read some info inside http://tahiti.oracle.com but somehow strangely the site is down.  

If the site comes up, make sure you check the performance tuning guide, a chapter on CBO, can't remember the exact name (might be just CBO).  

-Venu

-----Original Message-----

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Savio Pinto (s) Sent: 02 March 2006 16:32
To: paul.baumgartel_at_credit-suisse.com; oracle-l_at_freelists.org Subject: RE: CBO question ?

Thanks, but how can i check/verify that the statistics are stored for a particular table in the data dictionary ?

-----Original Message-----

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Baumgartel, Paul Sent: Thursday, March 02, 2006 9:31 AM
To: oracle-l_at_freelists.org
Subject: RE: CBO question ?

If any table mentioned in the query has statistics stored in the data dictionary, Oracle will use the CBO.  

Paul Baumgartel
paul.baumgartel_at_credit-suisse.com
212.538.1143

-----Original Message-----

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Savio Pinto (s) Sent: Thursday, March 02, 2006 10:28 AM
To: oracle-l_at_freelists.org
Subject: CBO question ?

Hi,

The execution plan for a query in oracle 9i shows "Optimizer= CHOOSE", how can i force the DB engine to use the COST based optimization for a query ?

Oracle version is 9.2.0.4.0

Thanks
Savio Pinto


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http://www.freelists.org/webpage/oracle-l Received on Thu Mar 02 2006 - 10:37:25 CST

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