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Re: Recover rows deleted

From: Alejandro Carrillo <fasterzip(at)yahoo(dot)es>
To: Jeff Davis <pgsql(at)j-davis(dot)com>
Cc: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Recover rows deleted
Date: 2012-06-04 16:14:11
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Anybody knows a function that let's recover a record (row) deleted in Windows?


> De: Jeff Davis <pgsql(at)j-davis(dot)com>
>Para: Alejandro Carrillo <fasterzip(at)yahoo(dot)es> 
>CC: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> 
>Enviado: Martes 29 de Mayo de 2012 15:53
>Asunto: Re: [PERFORM] Recover rows deleted
>On Mon, 2012-05-28 at 19:24 +0100, Alejandro Carrillo wrote:
>> Hi,
>> ¿How I can recover a row delete of a table that wasn't vacuummed?
>> I have PostgreSQL 9.1 in Windows XP/7.
>The first thing to do is shut down postgresql and take a full backup of
>the data directory, including any archived WAL you might have (files in
>pg_xlog). Make sure this is done first.
>Next, do you have any backups? If you have a base backup from before the
>delete, and all the WAL files from the time of the base backup until
>now, then you can try point-in-time recovery to the point right before
>the data loss:
>If not, are we talking about a single row, or many rows? If it's a
>single row you might be able to do some manual steps, like examining the
>pages to recover the data.
>Another option is to try pg_resetxlog (make sure you have a safe backup
>And try setting the current transaction ID to just before the delete
>ran. Then you may be able to use pg_dump or otherwise export the deleted
>    Jeff Davis
>Sent via pgsql-performance mailing list (pgsql-performance(at)postgresql(dot)org)
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