> On Postgres, this same query takes about 58 minutes (could not run > explain analyze because it is in progress): > > pg_dw=# explain CREATE TABLE ecr_opens with (FILLFACTOR=100) > pg_dw-# as > pg_dw-# select o.emailcampaignid, count(memberid) opencnt > pg_dw-# from openactivity o,ecr_sents s > pg_dw-# where s.emailcampaignid = o.emailcampaignid > pg_dw-# group by o.emailcampaignid; > QUERY > PLAN > ------------------------------------------------------------------------------------------------------------- > GroupAggregate (cost=0.00..1788988.05 rows=9939 width=12) > -> Nested Loop (cost=0.00..1742467.24 rows=9279316 width=12) > -> Index Scan using ecr_sents_ecid_idx on ecr_sents s > (cost=0.00..38.59 rows=479 width=4) > -> Index Scan using openact_emcamp_idx on openactivity o > (cost=0.00..3395.49 rows=19372 width=12) > Index Cond: (o.emailcampaignid = s.emailcampaignid) > (5 rows) > Please, post EXPLAIN ANALYZE, not just EXPLAIN. Preferably using explain.depesz.com. regards Tomas -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
