From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Peter Geoghegan <pg(at)bowt(dot)ie> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Subject: | Re: better page-level checksums |
Date: | 2022-06-13 21:54:33 |
Message-ID: | YqeyGZg9lEVXcxjF@momjian.us |
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Lists: | pgsql-hackers |
On Mon, Jun 13, 2022 at 02:44:41PM -0700, Peter Geoghegan wrote:
> On Fri, Jun 10, 2022 at 6:16 AM Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> > > My preference is for an approach that builds on that, or at least
> > > doesn't significantly complicate it. So a cryptographic hash or nonce
> > > can go in the special area proper (structs like BTPageOpaqueData don't
> > > need any changes), but at a page offset before the special area proper
> > > -- not after.
> > >
> > > What disadvantages does that approach have, if any, from your point of view?
> >
> > I think it would be an extremely good idea to store the extended
> > checksum at the same offset in every page. Right now, code that wants
> > to compute checksums, or a tool like pg_checksums that wants to verify
> > them, can find the checksum without needing to interpret any of the
> > remaining page contents. Things get sticky if you have to interpret
> > the page contents to locate the checksum that's going to tell you
> > whether the page contents are messed up. Perhaps this could be worked
> > around if you tried hard enough, but I don't see what we get out of
> > it.
>
> Is that the how block-level encryption feature from EDB Advanced Server does it?
Uh, EDB Advanced Server doesn't have a block-level encryption feature.
--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com
Indecision is a decision. Inaction is an action. Mark Batterson
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