Re: UNDO and in-place update

From: Peter Geoghegan <pg(at)heroku(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: UNDO and in-place update
Date: 2016-11-23 04:28:41
Message-ID: CAM3SWZSKjNfw=C0PgmAa0Eh=9By-1CfBXc_c4PQ08OPntC0Gaw@mail.gmail.com
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On Tue, Nov 22, 2016 at 7:01 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> This basic DO-UNDO-REDO protocol has been well-understood for
> decades.

FWIW, while this is basically true, the idea of repurposing UNDO to be
usable for MVCC is definitely an Oracleism. Mohan's ARIES paper says
nothing about MVCC.

--
Peter Geoghegan

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