| From: | Stephen Frost <sfrost(at)snowman(dot)net> |
|---|---|
| To: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
| Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Ryan Lambert <ryan(at)rustprooflabs(dot)com>, Joe Conway <mail(at)joeconway(dot)com>, Antonin Houska <ah(at)cybertec(dot)at>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, "Moon, Insung" <Moon_Insung_i3(at)lab(dot)ntt(dot)co(dot)jp>, Ibrar Ahmed <ibrar(dot)ahmad(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [Proposal] Table-level Transparent Data Encryption (TDE) and Key Management Service (KMS) |
| Date: | 2019-07-10 22:04:30 |
| Message-ID: | 20190710220430.GX29202@tamriel.snowman.net |
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| Lists: | pgsql-hackers |
Greetings,
* Tomas Vondra (tomas(dot)vondra(at)2ndquadrant(dot)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
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