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From Karl Wright <>
Subject Re: Manifold and pg_xlog data
Date Tue, 12 Nov 2013 15:21:14 GMT
Hi Marcello,

The person who came up with the recommendations in the Performance page was
not me, but rather a contributor who had all the hardware and database
expertise needed to tune the version of PostgreSQL that was current at that
time.  Perhaps he felt that PostgreSQL performs better with a longer
checkpoint interval, but I don't know that for certain.  It is possible,
therefore, that your mileage may vary.  In any case, there is no
*intrinsic* reason that you could not experiment with changing the numbers
and explore how the database performs.


On Tue, Nov 12, 2013 at 10:12 AM, Marcello Lorenzi <>wrote:

> Hi,
> we have configured PostgreSQL as described by Performance page on
> ManifoldCF website but after a large number of crawling (intensive sets of
> data), we have noticed that the directory pg_xlog uses more than 3 GB of
> space.
> This directory contains the WAL transaction file and the size of this is
> limited by the directive checkpoint_segments and in the document is written
> to set this value to 300 with a final size of 5 GB.
> Why this parameter is too high?
> Thanks,
> Marcello

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