On Wed, 27 Apr 2016 22:40:43 +1200 David Rowley <david.row...@2ndquadrant.com> wrote:
Hi David > > ... > > Planning time: 15.968 ms > > Execution time: 4313.755 ms > > > > Both the (rid, adverse) and the (id, age, gender, created) indexes are now > > used. > > > > Seems the (rid, adverse) is not being used. report_adverses_rid_idx > is your (rid) index. Ah ... good catch, I blame it on the late evening over here ;) > > Yet ... this is "only" 1 second faster, still 4 seconds to complete this > > query (the join(s)). Is this truly the most that I could get out of it ... > > or could further tweaking to PostgreSQL's configuration be of any help here? > > EXPLAIN ANALYZE also has quite a bit of timing overhead, so it might > not be taking quite as long as you think. > > How long does it take with EXPLAIN (ANALYZE, TIMING OFF) ... ? Hmmm, this takes roughly the same amount of time: Planning time: 39.889 ms Execution time: 4532.642 ms > Or perhaps just run the query, as there's only 448 rows anyway. Also, did not speed up much ... query time pulled from the log statement: 4305.686 ms. > -- > David Rowley http://www.2ndQuadrant.com/ > PostgreSQL Development, 24x7 Support, Training & Services Cheers, Tim -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
