Re: WAL file utilization question

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От Tom Lane
Тема Re: WAL file utilization question
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Msg-id 6775.1179345777@sss.pgh.pa.us
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Ответ на Re: WAL file utilization question  (Keaton Adams <kadams@mxlogic.com>)
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Keaton Adams <kadams@mxlogic.com> writes:
> Well, no, I'm not that paranoid where I expect checkpoints to be taking
> place so often.  I do find it interesting that controlling checkpoint
> frequency is a factor of the number of WAL files available.  In order to
> get up to 60 second checkpoints I had to set checkpoint_segments to 25,
> which resulted in the creation of 52 log files in data/pg_xlog.  So for
> 120 second checkpoints I will need to have up to 104 log files in
> data/pg_xlog available?

No, it's nonlinear, precisely because of the
checkpoints-increase-the-log-size effect.  Given the size of modern
disks, I don't see why a couple Gb of WAL space is a problem anyhow
for a large database.

            regards, tom lane

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