Horton

Re: [Proposal] Table-level Transparent Data Encryption (TDE) and Key Management Service (KMS)

Stephen Frost <sfrost@snowman.net>

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From: Stephen Frost <sfrost@snowman.net>
To: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>, Bruce Momjian <bruce@momjian.us>, Ryan Lambert <ryan@rustprooflabs.com>, Joe Conway <mail@joeconway.com>, Antonin Houska <ah@cybertec.at>, Masahiko Sawada <sawada.mshk@gmail.com>, Robert Haas <robertmhaas@gmail.com>, Haribabu Kommi <kommi.haribabu@gmail.com>, "Moon, Insung" <Moon_Insung_i3@lab.ntt.co.jp>, Ibrar Ahmed <ibrar.ahmad@gmail.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2019-07-10T22:04:30Z
Lists: pgsql-hackers

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  1. Revamp the WAL record format.

Greetings,

* Tomas Vondra (tomas.vondra@2ndquadrant.com) wrote:
> On Wed, Jul 10, 2019 at 04:11:21PM -0400, Alvaro Herrera wrote:
> >On 2019-Jul-10, Bruce Momjian wrote:
> >
> >>Uh, what if a transaction modifies page 0 and page 1 of the same table
> >>--- don't those pages have the same LSN.
> >
> >No, because WAL being a physical change log, each page gets its own
> >WAL record with its own LSN.
> >
> 
> What if you have wal_log_hints=off? AFAIK that won't change the page LSN.

Alvaro suggested elsewhere that we require checksums for these, which
would also force wal_log_hints to be on, and therefore the LSN would
change.

Thanks,

Stephen