dan@sidhe.org 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
