Re: pg_checksums?

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Daniel Gustafsson <daniel(at)yesql(dot)se>
Cc: Paul Förster <paul(dot)foerster(at)gmail(dot)com>, "pgsql-general(at)postgresql(dot)org >> PG-General Mailing List" <pgsql-general(at)postgresql(dot)org>
Subject: Re: pg_checksums?
Date: 2023-10-27 21:21:11
Message-ID: ZTwpx1sCIu-4EgRH@momjian.us
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On Fri, Oct 27, 2023 at 10:45:16PM +0200, Daniel Gustafsson wrote:
> > On 27 Oct 2023, at 20:34, Paul Förster <paul(dot)foerster(at)gmail(dot)com> wrote:
>
> > a) why isn't it possible to enable checksumming while a database cluster is up?
>
> It is surprisingly complicated to enable checksums on a live cluster, a patch
> was submitted a while back but ultimately never made it into postgres. The
> below threads may shine some light on the problem:
>
> https://www.postgresql.org/message-id/flat/CABUevEx8KWhZE_XkZQpzEkZypZmBp3GbM9W90JLp%3D-7OJWBbcg%40mail.gmail.com
> https://www.postgresql.org/message-id/flat/560A2239-5DE2-4B9C-92BC-878C6822F47C%40yesql.se#10b665b2193445a3d7f24be7917a952c

Yeah, it was a big surprise that this feature was so hard to implement
because we have _no_ infrastructure for having multiple data layouts
active in a live system. The discussion eventually made that clear.

If we have more features that need this kind of dynamic ability, we
might revisit this feature too.

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

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