Re: SQL select query becomes slow when using limit (with no offset)

> 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.