[Fwd: Checkpoint Location Format]

From: "Andy Shellam (Mailing Lists)" <andy(dot)shellam-lists(at)mailnetwork(dot)co(dot)uk>
To: pgsql-admin(at)postgresql(dot)org
Subject: [Fwd: Checkpoint Location Format]
Date: 2006-11-07 14:24:17
Message-ID: 45509711.8080807@mailnetwork.co.uk
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Further to the below e-mail, I've come across a slight problem.
The starting checkpoint location in a backup I've just taken is
"0/22A3190" (note: 7 digits after the /, not 6 as I first thought.)
However the .backup file is called <WAL_FILE>.002A3190 (ie. it only
takes the right-most 6 digits).

Can someone confirm this is the correct case?

Thanks,

Andy.

-------- Original Message --------
Subject: Checkpoint Location Format
Date: Tue, 07 Nov 2006 13:12:53 +0000
From: Andy Shellam (Mailing Lists) <andy(dot)shellam-lists(at)mailnetwork(dot)co(dot)uk>
To: pgsql-admin(at)postgresql(dot)org

Hi,

I'm writing an automated file-system level backup application for use
with WAL archiving, that will issue the pg_start_backup call, tar and
gzip the cluster data directory, issue the pg_stop_backup call, and
remove all previous un-needed WAL files from the archive.

I need to write a regular expression that will search for the WAL
filename and checkpoint location from the backup_label file, and just
want to clarify that the checkpoint location will always be of the
format: X/XXXXXX - where X is one of 0-9, A-F?

And then the WAL .backup file that is generated in the archive, has a
filename of the form:

<WAL_FILE>.00XXXXXX.backup

where <WAL_FILE> is the name of the "STARTING WAL LOCATION" directive in
the backup_label file, and XXXXXX is the last 6 digits of the checkpoint
(after the / )?

Thanks,

Andy.

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