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Subject: RE: Enforcing plan via SQL plan baseline
Date: Thu, 2 Feb 2012 16:17:39 -0500
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Thread-Topic: Enforcing plan via SQL plan baseline
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From: "Hameed, Amir" <Amir.Hameed@xerox.com>
To: "Antony Raj" <ca_raj@yahoo.com>,
 <oracle-l@freelists.org>
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Reply-To: Amir.Hameed@xerox.com

Thanks Raj.
I have tried it several times and the optimizer keeps ignoring the
manually loaded plan and overwriting it with the one that it is
generating, which is an optimal plan. So, the question is, can SQL
profiles be used to force a bad plan over a good plan?

 
Thanks

 
From: Antony Raj [mailto:ca_raj@yahoo.com] 
Sent: Thursday, February 02, 2012 4:14 PM
To: Hameed, Amir; oracle-l@freelists.org
Subject: Re: Enforcing plan via SQL plan baseline

 
Hi Amir,

 
You need to load the plan manually using DBMS_SPM package.Identify the
SQLID of the plan that you need.

Manually loaded plans are automatically marked as accepted, so manual
loading forces the evolving process.

 
Thanks

 
From: "Hameed, Amir" <Amir.Hameed@xerox.com>
To: oracle-l@freelists.org 
Sent: Thursday, February 2, 2012 3:56 PM
Subject: Enforcing plan via SQL plan baseline


Folks,
When using SQL plan baseline, is it possible to instruct the optimizer
to use a baseline that has sub-optimal plan than the one it is currently
using. For example, a SQL statement, which cannot be altered because it
is coming out of a COTS application, is currently using an index scan
and I would like to force it to use FTS. I have tried forcing the
optimizer to use the SQL plan baseline but it keeps using the index path
and hence ignoring the plan baseline. Any feedback will be appreciated.


Thanks

Amir


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