On Wed, 2002-04-17 at 06:51, mlw wrote:
> I just think there is sufficient evidence to suggest that if a DBA creates an
> index, there is strong evidence (better than statistics) that the index need be
> used. In the event that an index exists, there is a strong indication that,
> without overwhelming evidence, that the index should be used. You have admitted
> that statistics suck, but the existence of an index must weight (heavily) on
> the evaluation on whether or not to use an index.
But indexes are not, for the most part, there because of a specific
choice to have an index, but as the implementation of PRIMARY KEY and
UNIQUE. Therefore the main part of your argument fails.
--
Oliver Elphick Oliver.Elphick@lfix.co.uk
Isle of Wight http://www.lfix.co.uk/oliver
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"But as many as received him, to them gave he power to become the sons of God, even to them that believe on
his name." John 1:12