Carol Walter wrote:
> Ah-h-h, that's exactly my question. What part of Postgres "takes care
> of this itself." I'm asking because I had 86 pg_clog files dated back
> to mid-May. I got the impression from something Tom said that backups
> should prune this directory. Perhaps my "impression" was wrong. Most
> databases I've used in the past have gotten rid of the transaction
> logs, etc, when a backup is done. The restore process used that last
> backup and then applied the transaction logs to it. Once another
> backup was completed the old transaction logs were no longer needed.
> I'm trying to understand what happens "under the hood" so to speak.
> What checkpoint_settings value are you referring to?
Sorry. I had a brain/fingers disconnect. I meant the
"checkpoint_segments" setting. Anyway, answers to a number of your
questions regarding write-ahead logging may be found here:
http://www.postgresql.org/docs/8.3/interactive/wal-configuration.html
Cheers,
Steve