Re: Wrong docs on checkpoint_segments? - Mailing list pgsql-performance

From Florian Weimer
Subject Re: Wrong docs on checkpoint_segments?
Date
Msg-id 82mxnceskh.fsf@mid.bfk.de
Whole thread Raw
In response to Re: Wrong docs on checkpoint_segments?  (Andres Freund <andres@anarazel.de>)
Responses Re: Wrong docs on checkpoint_segments?  (Andres Freund <andres@anarazel.de>)
List pgsql-performance
* 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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