From: Florian Weimer <fweimer@bfk.de>
To: Andres Freund <andres@anarazel.de>
Cc: pgsql-performance@postgresql.org
Subject: Re: Wrong docs on checkpoint_segments?
Date: Fri, 07 Jan 2011 13:45:02 +0000
Message-ID: <82mxnceskh.fsf@mid.bfk.de> (raw)
In-Reply-To: <201101071439.32053.andres@anarazel.de>
References: <82aajcg9wa.fsf@mid.bfk.de>
<201101071439.32053.andres@anarazel.de>
* Andres Freund:
> On Friday, January 07, 2011 01:45:25 PM Florian Weimer wrote:
>> On 9.0, this configuration
>>
>> checkpoint_segments = 512 # in logfile segments, min 1, 16MB each
>>
>> results in 1034 segments, so the effective logfile segment size is 32 MB.
> Um. Is it possible that you redefined XLOG_SEG_SIZE or used --with-wal-
> segsize=SEGSIZE?
No, the individual files are still 16 MB. It's just that the
checkpoint_segments limit is not a hard limit, and you end up with
slightly more than twice the configured number of segments on disk.
--
Florian Weimer <fweimer@bfk.de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
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To: pgsql-performance@postgresql.org
Cc: fweimer@bfk.de, andres@anarazel.de
Subject: Re: Wrong docs on checkpoint_segments?
In-Reply-To: <82mxnceskh.fsf@mid.bfk.de>
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