Re: Trying to track down weird query stalls

dan(at)sidhe(dot)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/
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