Re: Index clustering factor
- From: "Jonathan Lewis" <jonathan@xxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 10 Jan 2008 07:10:07 -0000
The optimizer cannot ignore the index hint for that query.
Therefore the hint is illegal.
The first thing to check is whether you have a column
coercion issue. What are the types of the columns
and of the input variables - and what does OEM
tell you about the run-time predicates ?
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
Author: Cost Based Oracle: Fundamentals
http://www.jlcomp.demon.co.uk/cbo_book/ind_book.html
The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html
----- Original Message -----
From: "Orysia Husak" <Orysia.Husak@xxxxxxxxxxxxx>
Subject: RE: Index clustering factor
The statement is expected to fetch only 1 or 2 rows. The default Oracle
gather_stats generates a histogram size auto.
We've provided an index hint in the SQL and Oracle sill ignores the
index.
Our query is :
Select * from tableA where fielda=:A and fieldb=:B
We have an index on tableA (fielda, fieldb), but Oracle isn't using the
index.
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