Re: Difference between EXPLAIN ANALYZE SELECT ... total runtime and SELECT ... runtime

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От A. Kretschmer
Тема Re: Difference between EXPLAIN ANALYZE SELECT ... total runtime and SELECT ... runtime
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Msg-id 20100723051627.GA31850@a-kretschmer.de
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Ответ на Difference between EXPLAIN ANALYZE SELECT ... total runtime and SELECT ... runtime  (Piotr Gasidło <quaker@barbara.eu.org>)
Ответы Re: Difference between EXPLAIN ANALYZE SELECT ... total runtime and SELECT ... runtime  (Piotr Gasidło <quaker@barbara.eu.org>)
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In response to Piotr Gasid??o :
> Hello,
>
> I have strange problem.
>
> I test/optimize my queries with EXPLAIN ANALYZE. I get for example:
>
> Total runtime: 40.794 ms
>
> But when I run query without EXPLAIN ANALYZE i get, for example:
>
> Time: 539.252 ms
>
> Query returns 33 rows. Why?

Maybe cheaply or virtuell hardware? There are some issues with functions
like gettimoofday(), see here:

http://archives.postgresql.org/pgsql-general/2007-01/msg01653.php
(and the whole thread)

Regards, Andreas
--
Andreas Kretschmer
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