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Re: Really dumb planner decision

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Matthew Wakeling <matthew(at)flymine(dot)org>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Merlin Moncure <mmoncure(at)gmail(dot)com>, Grzegorz Jaśkiewicz <gryzman(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Really dumb planner decision
Date: 2009-04-16 16:04:40
Message-ID: 19203.1239897880@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-performance
Matthew Wakeling <matthew(at)flymine(dot)org> writes:
> On Thu, 16 Apr 2009, Robert Haas wrote:
>> I hasten to point out that I only suggested raising them to the moon
>> as a DEBUGGING strategy, not a production configuration.

> The problem is that we have created a view that by itself a very 
> time-consuming query to answer, relying on it being incorporated into a 
> query that will constrain it and cause it to be evaluated a lot quicker. 
> This kind of scenario kind of guarantees a bad plan as soon as the number 
> of tables reaches from_collapse_limit.

Well, if the payoff for you exceeds the extra planning time, then you
raise the setting.  That's why it's a configurable knob.  I was just
pointing out that there are downsides to raising it further than
absolutely necessary.

			regards, tom lane

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