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Re: query memory consumption

From: Grzegorz Jaśkiewicz <gryzman(at)gmail(dot)com>
To: Alan McKay <alan(dot)mckay(at)gmail(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: query memory consumption
Date: 2009-09-22 12:41:25
Message-ID: (view raw or whole thread)
Lists: pgsql-performance
On Tue, Sep 22, 2009 at 1:36 PM, Alan McKay <alan(dot)mckay(at)gmail(dot)com> wrote:

> Too high?  How high is too high?

in a very simple scenario, you have 100 connections opened, and all of
them run the query that was the reason you bumped work_mem to 256M.
All of the sudden postgresql starts to complain about lack of ram,
because you told it it could use max of

Best practice to avoid that, is to bump the work_mem temporarily
before the query, and than lower it again, lowers the chance of memory


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