| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Joe Conway <mail(at)joeconway(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Ryan Lambert <ryan(at)rustprooflabs(dot)com>, Antonin Houska <ah(at)cybertec(dot)at>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(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 00:04:05 |
| Message-ID: | 20190711000405.m7xhtyhynqym6vtu@momjian.us |
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| Lists: | pgsql-hackers |
On Wed, Jul 10, 2019 at 06:28:42PM -0400, Alvaro Herrera wrote:
> On 2019-Jul-10, Joe Conway wrote:
>
> > On 7/10/19 3:53 PM, Alvaro Herrera wrote:
>
> > > (I do think you can have multiple writes of the same page with
> > > different LSNs, if you change hint bits and don't write WAL about it,
> >
> > Do you mean "multiple writes of the same page without..."?
>
> Right, "twice the same page with the same LSN" is what I was thinking,
> which is basically the question Tomas asked afterwards.
Just to clarify, the case being discussed above is where we modify a
page with a new row, write the page with an LSN, then change a hint bit
on the page, and, if log_hint_bits is false, write the page with the
hint bit change without changing the LSN since we didn't log hint bits.
--
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. +
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