Re: Query planner wants to use seq scan

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От Tom Lane
Тема Re: Query planner wants to use seq scan
Дата
Msg-id 21872.1445947392@sss.pgh.pa.us
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Ответ на Query planner wants to use seq scan  (Bertrand Paquet <bertrand.paquet@doctolib.fr>)
Ответы Re: Query planner wants to use seq scan  (Bertrand Paquet <bertrand.paquet@doctolib.fr>)
Re: Query planner wants to use seq scan  (Bertrand Paquet <bertrand.paquet@doctolib.fr>)
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Bertrand Paquet <bertrand.paquet@doctolib.fr> writes:
> We have a slow query. After analyzing, the planner decision seems to be
> discutable : the query is faster when disabling seqscan. See below the two
> query plan, and an extract from pg_stats.

> Any idea about what to change to help the planner ?

Neither one of those plans is very good: you're just hoping that the
Filter condition will let a tuple through sooner rather than later.

If you care about the performance of this type of query, I'd consider
creating an index on (organization_id, status, handled_by) so that all
the conditions can be checked in the index.

            regards, tom lane


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