Re: Slow "Select count(*) ..." query on table with 60 Mio. rows

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От Ivan Voras
Тема Re: Slow "Select count(*) ..." query on table with 60 Mio. rows
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Msg-id hinf1q$qop$1@ger.gmane.org
обсуждение исходный текст
Ответ на Re: Slow "Select count(*) ..." query on table with 60 Mio. rows  ("Kevin Grittner" <Kevin.Grittner@wicourts.gov>)
Ответы Re: Slow "Select count(*) ..." query on table with 60 Mio. rows
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Дерево обсуждения 
Kevin Grittner wrote:
> Matthew Wakeling <matthew@flymine.org> wrote:
>
>> This is an FAQ.
>
> I just added it to the wiki FAQ page:
>
> http://wiki.postgresql.org/wiki/FAQ#Why_is_.22SELECT_count.28.2A.29_FROM_bigtable.3B.22_slow.3F

Maybe you could add a short note why an estimation like from the
pg_class table is usually enough.

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