| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | dan(at)sidhe(dot)org |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Trying to track down weird query stalls |
| Date: | 2009-03-30 21:00:22 |
| Message-ID: | 20090330210022.GG23023@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-performance |
dan(at)sidhe(dot)org escribió:
> > 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.
>
> I don't think so. Perl's DBI is involved, but the statement's in a
> variable.
So what's the "?" in the query you pasted earlier?
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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