"Daniel Cristian Cruz" <danielcristian@xxxxxxxxx> writes: > -> Nested Loop (cost=0.00..13187.94 rows=93 width=4) (actual time=2.622..125.739 rows=50 loops=1) > -> Seq Scan on u (cost=0.00..2838.80 rows=10289 width=4) (actual time=0.012..9.863 rows=10291 loops=1) > -> Index Scan using m_pkey on m (cost=0.00..0.80 rows=1 width=7) (actual time=0.009..0.009 rows=0 loops=10291) That's not discounting the nested loop for cache effect at all! What is your effective_cache_size for this? -- Gregory Stark EnterpriseDB http://www.enterprisedb.com