RE: Difference between count(1) and count(*)

From: Michael Thomas <mhthomas_at_yahoo.com>
Date: Thu, 8 Jul 2004 08:49:09 -0700 (PDT)
Message-ID: <20040708154909.23186.qmail@web50603.mail.yahoo.com>

Dear Sirs,

You will find, especially on this list, that you might attempting to extract a rule from an aggregate statistic. Do not do this if you do not *know* how to measure the details. It is much worse than someone suggesting that count(*) or count(1) is faster.

Please, figure out what is CTD, too.

Instead of wasting time, bandwith, effort in pursuit of the subject on this email, you *must* immediately purchase, obtain, or access a copy of Optimizing Oracle Performance by Millsap and Holt. And, read it. ;-)

HTH. Much humor was apparently missed
between-the-lines on these replies. Oh well.

Regards,

Mike Thomas

BTW: The 'C' in CTD is not curiousity, but it could be. :-)

• Srinivasan Vasan <Vasan.Srinivasan_at_churchill.com> wrote:
  > Is this a difference between RBO and CBO? I am on
  > CBO on 9.2.0.5 and my
  > timings are similar to Mladen's - i.e., almost the
  > same for all types of
  > counts.
  >
  > Cheers,
  >
  > Vasan.
  

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Received on Thu Jul 08 2004 - 10:46:33 CDT