RE: Creating Histograms

From: Juan Carlos Reyes Pacheco <jreyes_at_dazasoftware.com>
Date: Wed, 21 Jul 2004 14:47:44 -0400
Message-Id: <40FEBA50.00001D.00336@CACHITOSS>

Hi David, then how do you get cbo uses the histogram and do a full scan, when this is more than 90% of the data
changing the optimizer index parameter?
If you can't get CBO use the histogram by himself, you get nothing.

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

From: oracle-l_at_freelists.org
Date: 07/21/04 14:26:32
To: oracle-l_at_freelists.org
Subject: RE: Creating Histograms

Unless I'm mistaken I believe the concensus on here is that a higher cost does not necessarily indicate a poorer plan. Just wanted to point that out in reference to the cost being higher mentioned below...+

--
.
David


> But it seems not to be, a full scan cost 40 more, so it seems this is not

> a

> good place to use histograms.-

 
----------------------------------------------------------------
Please see the official ORACLE-L FAQ: http://www.orafaq.com
----------------------------------------------------------------
To unsubscribe send email to: oracle-l-request_at_freelists.org
put 'unsubscribe' in the subject line.
--
Archives are at http://www.freelists.org/archives/oracle-l/
FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html
-----------------------------------------------------------------
----------------------------------------------------------------
Please see the official ORACLE-L FAQ: http://www.orafaq.com
----------------------------------------------------------------
To unsubscribe send email to:  oracle-l-request_at_freelists.org
put 'unsubscribe' in the subject line.
--
Archives are at http://www.freelists.org/archives/oracle-l/
FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html
-----------------------------------------------------------------

Received on Wed Jul 21 2004 - 13:49:50 CDT