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Re: odd planner again, pg 9.0.8

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Marcus Engene <mengpg2(at)engene(dot)se>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: odd planner again, pg 9.0.8
Date: 2012-07-25 16:39:09
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Marcus Engene <mengpg2(at)engene(dot)se> writes:
> Lacking index hints I have a bit of a problem with a slow select.

I don't think you need index hints.  What you probably do need is to
increase join_collapse_limit and/or from_collapse_limit to deal with
this complex query as a whole.

> There are several selects looking similar to this in our application 
> that suddenly jumped from a handfull of ms to many seconds.

Perhaps you had those settings adjusted properly and somebody turned
them off again?

			regards, tom lane

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