Re: BUG #4462: Adding COUNT to query causes massive slowdown

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От Peter Eisentraut
Тема Re: BUG #4462: Adding COUNT to query causes massive slowdown
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Msg-id 48EDF376.80801@gmx.net
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Ответ на BUG #4462: Adding COUNT to query causes massive slowdown  ("Jussi Pakkanen" <jpakkane@gmail.com>)
Ответы Re: BUG #4462: Adding COUNT to query causes massive slowdown  ("Jussi Pakkanen" <jpakkane@gmail.com>)
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Jussi Pakkanen wrote:
> However when I try to count the amount of distinct codes, I get this:
>
>
> EXPLAIN SELECT COUNT(DISTINCT code) FROM log;
>                                    QUERY PLAN
> ----------------------------------------------------------------------------
> -----
>  Aggregate  (cost=100801488.30..100801488.31 rows=1 width=10)
>    ->  Seq Scan on log  (cost=100000000.00..100721245.24 rows=32097224
> width=10)
> (2 rows)

This looks like you have one of the enable_${plantype} parameters turned
off.  100000000 is the penalty that is added when a plantype if turned off.

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