From: Dan Nelson
Date: September 7 2006 5:18am
Subject: Re: problem with InnoDB
List-Archive: http://lists.mysql.com/mysql/201699
Message-Id: <20060907051840.GA67738@dan.emsphone.com>
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In the last episode (Sep 07), prasad.ramisetti@stripped said:
> Hi Dan,
> 
> Thanks for yur response. Does it makes sense to create an index on a
> primary key ..as that is my smallest field ?

It might, because in an InnoDB table, your primary index also holds
your row data.  So it's actually your largest index.  A full scan of a
secondary index on your primary key may very well run faster than a
scan of the primary index itself, for the purposes of "SELECT
COUNT(*)".  Best way to find out is to try it :)

-- 
	Dan Nelson
	dnelson@stripped