Re: Trivial query, large query, but very sad results.

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От Dan Langille
Тема Re: Trivial query, large query, but very sad results.
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Msg-id 20020402105107.H72232-100000@m20.unixathome.org
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Ответ на Re: Trivial query, large query, but very sad results.  (Dan Langille <dan@langille.org>)
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On Tue, 2 Apr 2002, Dan Langille wrote:

> On Tue, 2 Apr 2002, [iso-8859-1] Alexander Hav�ng wrote:
>
> > When I do a query, say,
> > SELECT count(id) FROM bigtable WHERE somestring='something';
> > then what I would expect from the database is that it would completely hog the cpu
> > and disk i/o for a while until the query is completed, which on this machine well..
> > should take one or two minutes. Instead, it takes 12 minutes.
>
> Out of interest, what results do you get from select count(*) ...?  I
> would expect it to be faster.

I also meant to ask: Do you have any indexes?  On id?  On somestring?


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