From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
Cc: | Stephen Frost <sfrost(at)snowman(dot)net>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, 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: | 2019-07-11 00:07:49 |
Message-ID: | 20190711000749.5z6ex55chmv43bxf@momjian.us |
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Lists: | pgsql-hackers |
On Thu, Jul 11, 2019 at 12:18:47AM +0200, Tomas Vondra wrote:
> On Wed, Jul 10, 2019 at 06:04:30PM -0400, Stephen Frost wrote:
> > 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.
> >
>
> Oh, I see - yes, that would solve the hint bits issue. Not sure we want
> to combine the features like this, though, as it increases the costs of
> TDE. But maybe it's the best solution.
Uh, why can't we just force log_hint_bits for encrypted tables? Why
would we need to use checksums as well?
Why is page-number not needed in the nonce? Because it is duplicative
of the LSN? Can we use just LSN? Do we need pg_class.oid too?
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
+ Ancient Roman grave inscription +
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