Re: Forcing query to use an index - Mailing list pgsql-sql

From Josh Berkus
Subject Re: Forcing query to use an index
Date
Msg-id 200303031521.48013.josh@agliodbs.com
Whole thread Raw
In response to Re: Forcing query to use an index  (Michael Nachbaur <mike@nachbaur.com>)
Responses Re: Forcing query to use an index  (Michael Nachbaur <mike@nachbaur.com>)
List pgsql-sql
Micheal,

Don't forget to run ANALYZE as well; this does not require a table lock.

> Does using "set enable_seqscan = off" impact anything else on the
> system, or is it connection-specific?  Is this the recommended way of
> doing this, or is there another way of coercing Postgres into using
> indexes?  I'm making these queries from Perl code running in an XSP
> page, so I'm not sure how flexible this option would be from a
> developer point of view.

Setting enable_seqscan=off is just for testing purposes, to see if the planner
is making a wrong decision so that you can adjust your .conf params, query,
and/or indexes to suit.  The setting is *not* intended as a production
solution.

--
-Josh BerkusAglio Database SolutionsSan Francisco



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