Re: low perfomances migrating from 9.3 to 9.5

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От Michael Paquier
Тема Re: low perfomances migrating from 9.3 to 9.5
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Msg-id CAB7nPqS0BU-3kwXB72p+1-jsXFbUApKgY2FqLcn6r6mNXHmNxw@mail.gmail.com
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Ответ на Re: low perfomances migrating from 9.3 to 9.5  (thomas veymont <thomas.veymont@gmail.com>)
Ответы Re: low perfomances migrating from 9.3 to 9.5  (thomas veymont <thomas.veymont@gmail.com>)
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On Wed, Jul 27, 2016 at 6:22 PM, thomas veymont
<thomas.veymont@gmail.com> wrote:
> as far as I remember these settings were for faster bulk loading.
>
> in 9.5 we set:
> max_wal_size = 6GB                      #
> https://www.postgresql.org/docs/9.5/static/release-9-5.html, max_wal_size =
> (3 * checkpoint_segments) * 16MB
> #min_wal_size = 80MB
>
> though I tried max_wal_size = 3GB (default is 1GB) and did not notice any
> improvment.

And do you see changes if you increase min_wal_size? This will
increase the number of WAL segments recycled instead of removed at
each checkpoint.
--
Michael


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