Re: PG and undo logging

From: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>
To: Ravi Krishna <sravikrishna3(at)gmail(dot)com>
Cc: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: Re: PG and undo logging
Date: 2015-05-23 20:48:11
Message-ID: CAKFQuwaPih3_bi1MFMPPf_fNMnDLPbt0iw0JqJM-8FBPP8hkJg@mail.gmail.com
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On Sat, May 23, 2015 at 1:34 PM, Ravi Krishna <sravikrishna3(at)gmail(dot)com>
wrote:

> Is it true that PG does not log undo information, only redo. If true,
> then how does it bring a database back to consistent state during
> crash recovery. Just curious.
>

​What does "undo" mean?

David J.​

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