Explain analyze would be nice ;-) > -----Original Message----- > From: pgsql-performance-owner@xxxxxxxxxxxxxx > [mailto:pgsql-performance-owner@xxxxxxxxxxxxxx] On Behalf Of Andrus > Sent: Tuesday, April 04, 2006 3:37 PM > To: pgsql-performance@xxxxxxxxxxxxxx > Subject: [PERFORM] Query runs too long for indexed tables > > I have relatively small tables (toode and rid) in fast server. > Both tables are indexed on toode field. > > Following query takes long time to run. > toode field type is char(20). It is difficult to change this > field type. > > Any idea how to speed up this query ? > > UPDATE firma1.rid SET toode=NULL > WHERE toode IS NOT NULL AND > toode NOT IN (SELECT TOODE FROM firma1.TOODE); > > Query returned successfully: 0 rows affected, 594813 ms > execution time. > > explain window shows: > > Seq Scan on rid (cost=2581.07..20862553.77 rows=51848 width=1207) > Filter: ((toode IS NOT NULL) AND (NOT (subplan))) > SubPlan > -> Materialize (cost=2581.07..2944.41 rows=14734 width=84) > -> Seq Scan on toode (cost=0.00..2350.34 > rows=14734 width=84) > > > Andrus. > > > > ---------------------------(end of > broadcast)--------------------------- > TIP 5: don't forget to increase your free space map settings >
