dan@xxxxxxxxx escribió: > where libinstance.libdate <= 1238445044 > and libinstance.enddate > 1238445044 > and libinstance.libinstanceid = libobject.libinstanceid > and libinstance.architecture = ? How are you generating the explain? My bet is that you're just substituting a literal in the architecture condition, but if the driver is smart then maybe it's preparating the query beforehand. You'll get a different plan in that case. Try something like this: prepare foo(smallint) as ... where libinstance.architecture = $1 ... explain analyze execute foo(1); If the plan you get from that is bad (and it often is), you should look at avoiding a query prepare. -- Alvaro Herrera http://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
