Re: Extract transactions from wals ??

From: Rob Sargent <robjsargent(at)gmail(dot)com>
To: Marc Millas <marc(dot)millas(at)mokadb(dot)com>
Cc: Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org>
Subject: Re: Extract transactions from wals ??
Date: 2019-11-21 17:04:06
Message-ID: 2679CE43-A0FE-4399-B146-2D3504E55403@gmail.com
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> On Nov 21, 2019, at 9:35 AM, Marc Millas <marc(dot)millas(at)mokadb(dot)com> wrote:
>
> Hi Laurenz,
>
>
> I was writing select from ""table"" as a template. We have to do this for a bunch of tables.
> So, to my understanding, what you suggest is to PITR up to the first timestamp, extract all meaningfull tables, and then pitr to the second timestamp
> so as to be able to script a kind of "diff" between the 2 to get what I want.
>
> Yes ?
>
> Marc MILLAS
> Senior Architect
> +33607850334
> www.mokadb.com <http://www.mokadb.com/>
>
>
>
> On Thu, Nov 21, 2019 at 5:16 PM Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at <mailto:laurenz(dot)albe(at)cybertec(dot)at>> wrote:
> On Thu, 2019-11-21 at 17:07 +0100, Marc Millas wrote:
> > you say "extract the data you need"
> > That is exactly the point of my question, as the PITR step was obvious.
> > How to guess "what is the data" I need ??
>
> Well, you asked for the contents of a table AS OF TIMESTAMP <something>.
>
> That means you know which table and which timestamp.
>
> So restore the PostgreSQL cluster to that timestamp, connect
> and SELECT from the table.
>
> Yours,
> Laurenz Albe
> --
> Cybertec | https://www.cybertec-postgresql.com <https://www.cybertec-postgresql.com/>
>

Are you by any chance logging sql at a sufficient level of detail to allow a restore to PIT and sql replay?

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