Ow Mun Heng wrote: > > On Wed, 2007-10-17 at 22:47 -0300, Alvaro Herrera wrote: > > Ow Mun Heng wrote: > > > > > Index Cond: ((audit_key_dtime >= $0) AND (audit_key_dtime < $1)) > > > > > > > > > Index Cond: ((audit_key_dtime >= '2007-08-08 18:00:00'::timestamp without time zone) > > > AND (audit_key_dtime < '2007-08-08 18:01:00'::timestamp without time zone)) > > > > > > This is _the_ only difference between the 2 queries where on one, the > > > dates are provided, and the other is selected from a table. > > > > > > I have no idea why the plans are so different between the two. > > > > The difference is that it has to consider the worst possibility in the > > second case, whereas the other one knows the interval is just one minute. > > Actually the dates are just 1 min apart in both cases. Of course. My point is that the planner doesn't know that in the first case. -- Alvaro Herrera http://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc. ---------------------------(end of broadcast)--------------------------- TIP 2: Don't 'kill -9' the postmaster
