Re: Re: which should be faster

What I tried to say over the weekend was:

Predicate order should not matter in 9i
because you should be using CPU costing, and Oracle 9i will re-arrange predicate ordering to minimise CPU load, and report this fact in the explain plan.

Predicate order CAN have an impact on
8.1.7 because Oracle 8i (and earlier) does not consider CPU cost when working out
an execution plan.

Regards

Jonathan Lewis
http://www.jlcomp.demon.co.uk

  The educated person is not the person
  who can answer the questions, but the
  person who can question the answers -- T. Schick Jr

One-day tutorials:
http://www.jlcomp.demon.co.uk/tutorial.html

____Denmark__May 21-23rd
____Sweden___June
____Finland__September
____Norway___September

Three-day seminar:
see http://www.jlcomp.demon.co.uk/seminar.html

____UK_(Manchester)_May x 2
____Estonia___June (provisional)
____Australia_June (provisional)
____USA_(CA, TX)_August

The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: 05 May 2003 18:01

> jonathan lewis posted over the weekend that it does. He said it does
in 9i unless you have a certain parameter set. Cant remember what that was off-hand.
>
> >
> > From: "AK" <oramagic_at_hotmail.com>
> > Date: 2003/05/05 Mon AM 11:46:41 EDT
> > To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > Subject: Re: which should be faster
> >
> > does predicate order makes diff in cob also ?
> > oracle 8.1.7
> >

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Jonathan Lewis
  INET: jonathan_at_jlcomp.demon.co.uk

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).