Am Donnerstag, 30. März 2006 14:02 schrieb Steinar H. Gunderson: > On Thu, Mar 30, 2006 at 01:59:10PM +0200, Peter Eisentraut wrote: > > EXPLAIN ANALYZE select activity_id from activity where state in (10000, > > 10001) order by activity_id limit 100; > > > > QUERY PLAN > > > > Limit (cost=0.00..622.72 rows=100 width=8) (actual > > time=207356.054..207356.876 rows=100 loops=1) > > -> Index Scan using activity_pk on activity (cost=0.00..40717259.91 > > rows=6538650 width=8) (actual time=207356.050..207356.722 rows=100 > > loops=1) Filter: ((state = 10000) OR (state = 10001)) > > Total runtime: 207357.000 ms > > > > The table has seen VACUUM FULL and REINDEX before this. > > The index scan is by activity_id, not by state. Do you have an index on > state at all? There is an index on state as well but the column is not selective enough. -- Peter Eisentraut http://developer.postgresql.org/~petere/
