RE: CBO question ?

From: Ric Van Dyke <ric.van.dyke_at_hotsos.com>
Date: Thu, 2 Mar 2006 10:43:42 -0600
Message-ID: <C970F08BBE1E164AA8063E01502A71CF4847C9@WIN02.hotsos.com>

http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96533/opti mops.htm#PFGRF001

This is a good place to start. Tahiti appears to be up now.

Ric Van Dyke

Hotsos Enterprises

Hotsos Symposium, be there:

http://www.hotsos.com/portal/events/SYM06

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Andem, Venu
Sent: Thursday, March 02, 2006 11:37 AM
To: oracle-l_at_freelists.org
Subject: RE: CBO question ?

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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Received on Thu Mar 02 2006 - 10:43:42 CST