Re: Checkpoint Location Format

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Hi Jim,

Tom did answer actually! (Although it was first thing in the morning and he hadn't had any caffeine so he may have forgot to copy the list in ;) ) I forget what he said the format was now, and I haven't got his e-mail, but I've just done a regex to match one or more characters before and after the "/", which works.

Andy.

Jim C. Nasby wrote:
On Tue, Nov 07, 2006 at 01:12:53PM +0000, Andy Shellam (Mailing Lists) wrote:
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 / )?

I don't know the answer, but since no one's replied I suggest looking in
the code. Looking at the source of pg_start_backup would probably be a
good start, though I'm guessing the real answer is somewhere in the
backend.



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