Re: Long Running Commits - Not Checkpoints

From: Brad Nicholson <bnichols(at)ca(dot)afilias(dot)info>
To: Greg Smith <gsmith(at)gregsmith(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Long Running Commits - Not Checkpoints
Date: 2007-09-13 16:19:45
Message-ID: 1189700385.8624.32.camel@bnicholson-desktop
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On Thu, 2007-09-13 at 12:12 -0400, Greg Smith wrote:
> On Thu, 13 Sep 2007, Brad Nicholson wrote:

> I'd be curious to see how you've got your background writer configured to
> see if it matches situations like this I've seen in the past. The
> parameters controlling the all scan are the ones you'd might consider
> turning down, definately the percentage and possibly the maxpages as well.

bgwriter_delay = 50 # 10-10000 milliseconds between
rounds
bgwriter_lru_percent = 20.0 # 0-100% of LRU buffers
scanned/round
bgwriter_lru_maxpages = 300 # 0-1000 buffers max
written/round
bgwriter_all_percent = 20 # 0-100% of all buffers
scanned/round
bgwriter_all_maxpages = 600 # 0-1000 buffers max
written/round

--
Brad Nicholson 416-673-4106
Database Administrator, Afilias Canada Corp.

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