RE: Index clustering factor

Jonathan,

Thank you for your suggestions! There was indeed column conversion
occurring causing the index not to be used. 

I appreciate your assistance and love your book. Looking forward to the
next one!

Orysia

Orysia Husak
Sr. Oracle DBA - Classroom Applications Hosting
University of Phoenix/ Apollo Group, Inc.
Office: 602-557-6934
Mobile: 602-377-8586
orysia.husak@xxxxxxxxxxxxx
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Jonathan Lewis
Sent: Thursday, January 10, 2008 12:10 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: Index clustering factor



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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