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Message Posted: Wed, 10 Jan 2001 @ 22:58:38 GMT

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Subj:   Re: Limited Select
From:   Jim Downey

I attended a class at Partners this year and the instructor (whom I consider very knowledgeable within NCR) made the statement that the EXPLAIN provides a cost and not a time estimate. They further explained (no pun intended) that it was never intended to convey an estimate of time to run a query.

I thought that interesting since it is expressed as a unit of time.

In any case I have always used the explain as a relative measure of time for a query. Does anyone use this time estimate and expect accurate estimates of query time? How accurate is accurate?

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