Re: oracle can ignore hints
- From: "Jonathan Lewis" <jonathan@xxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 4 Mar 2004 21:39:37 -0000
No.
The intent is that they should be absolute directives;
but there are conditions that put hints out of context,
which means they become irrelevant.
If it can happen at all, it can be hinted.
Regards
Jonathan Lewis
http://www.jlcomp.demon.co.uk
The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html
March 2004 Hotsos Symposium - The Burden of Proof
Dynamic Sampling - an investigation
March 2004 Charlotte OUG (www.cltoug.org) CBO Tutorial
April 2004 Iceland
June 2004 UK - Optimising Oracle Seminar
----- Original Message -----
From: "April Wells" <AWells@xxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Thursday, March 04, 2004 7:44 PM
Subject: RE: oracle can ignore hints
:
: Yep, they are 'friendly suggestions' that the CBO can simply choose to
: ignore if it thinks it knows better than you.
:
: We have one query that we have hinted, we have computed statistics, we
have
: built histograms, we have jumped through hoops... the only way to force it
: to use an index is to Never analyze that index and to hope, then, that the
: CBO makes the right assumptions.
:
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