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Message from discussion CBO & different execution plans
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DA Morgan  
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 More options Mar 12 2007, 6:16 pm
Newsgroups: comp.databases.oracle.server
From: DA Morgan <damor...@psoug.org>
Date: Mon, 12 Mar 2007 15:16:51 -0700
Local: Mon, Mar 12 2007 6:16 pm
Subject: Re: CBO & different execution plans
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Charles Hooper wrote:
> *
> ERROR at line 1:
> ORA-30394: source statement identical to the destination statement
> ORA-06512: at "SYS.DBMS_ADVANCED_REWRITE", line 29
> ORA-06512: at "SYS.DBMS_ADVANCED_REWRITE", line 185
> ORA-06512: at line 2

> It would be nice to use DBMS_ADVANCED_REWRITE to add a hint, such as
> (for the OP):
>   /*+ LEADING (HTS_ASSAY HTS_COMPOUND_LOT HTS_ASSAY_RESULT) */

> And leave the rest of the SQL statement alone.

> Charles Hooper
> PC Support Specialist
> K&M Machine-Fabricating, Inc.

I agree. Maybe you could fool the CBO by making some inconsequential
change so that it would see the statement as different. For example:

For example:
WHERE C2+0 = x+0;

Though, of course, that can cause unintended collateral damage.
--
Daniel A. Morgan
University of Washington
damor...@x.washington.edu
(replace x with u to respond)
Puget Sound Oracle Users Group
www.psoug.org


 
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