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Re: Writing WAL files

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On 10/4/20 10:30 AM, Robert Inder wrote:


On Sun, 4 Oct 2020 at 18:01, Adrian Klaver <adrian.klaver@xxxxxxxxxxx <mailto:adrian.klaver@xxxxxxxxxxx>> wrote:

    On 10/4/20 9:54 AM, Robert Inder wrote:
     > I am moving a database from PSQL 9 (!) on CentOS 6 to PSQL 12 on
    CentOS 7

    It would help to know what the x in 9.x is? Before version 10 of
    Postgres, the second number denoted a major version.


9.4.
Moving to 12.4.

Well I'm going to say it has to do with this:

https://www.postgresql.org/docs/10/release-10.html

E.15.3.1.9.1. Write-Ahead Log (WAL)
Prevent unnecessary checkpoints and WAL archiving on otherwise-idle systems (Michael Paquier)

Because that is when this:

". (Increasing checkpoint_timeout will reduce unnecessary checkpoints on an idle system.)"

disappeared from the archive_timeout docs:

https://www.postgresql.org/docs/9.6/runtime-config-wal.html

vs

https://www.postgresql.org/docs/10/runtime-config-wal.html

Someone else will have to fill in the details.


--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx





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