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List:       pgsql-performance
Subject:    Re: [PERFORM] SQL select query becomes slow when using limit (with no
From:       PFC <lists () peufeu ! com>
Date:       2009-07-31 12:46:45
Message-ID: op.uxxm37opcigqcu () soyouz
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> The query:
> select events_events.id FROM events_events
> left join events_event_types on events_events.eventType_id=
> events_event_types.id
> where events_event_types.severity=70
> and events_events.cleared='f'
> order by events_events.dateTime DESC

	The main problem seems to be lack of a suitable index...

- Try creating an index on events_events( eventType_id, cleared )
- Or the other way around : events_events( cleared, eventType_id )

	(depends on your other queries)

	Please try both and report EXPLAIN ANALYZE.

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