RE: Difference between count(1) and count(*)
- From: Michael Thomas <mhthomas@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 8 Jul 2004 08:49:09 -0700 (PDT)
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@xxxxxxxxxxxxx>
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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