Sam Mason <sam@xxxxxxxxxxxxx> wrote: > On Sun, Jul 19, 2009 at 11:15:39AM +0100, Pedro Doria Meunier wrote: > > I have a table ~18M rows with a 'timestamp with time zone' column. It's > > indexed thus: > > > > CREATE INDEX my_table_timestamp_idx > > ON my_table > > USING btree > > (zulu_timestamp); > > Based on your query, I think you want a multi-column index---probably on > (id,zulu_timestamp). > > The problem with just having an index on either column is that it's > difficult to combine them and PG hence just thinks that it will be Since 8.1 PG can do an bitmap index scan using both indexes... Andreas -- Really, I'm not out to destroy Microsoft. That will just be a completely unintentional side effect. (Linus Torvalds) "If I was god, I would recompile penguin with --enable-fly." (unknown) Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889° -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
