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Re: pg_xlog and standby

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On Wed, 23 Jan 2008, Roberto Scattini wrote:

the problem that im having is that i have A LOT of
archive files on pg_xlog dir, and thats because the archive_command
keeps failing (the standby server had filled his disk with archives
received but not proccesed), so now, i dont know how i can remove
those files and start again...

Under normal operation the checkpoint process will look at the number of already created archive files, keep around up to (2*checkpoint_segments+1) of them for future use, and delete the rest of them. You never delete them yourself, the server will take care of that automatically once it gets to where it makes that decision. If you set checkpoint_segments to some very high number they can end up taking many GB worth of storage, increasing that parameter has at least two costs associated with it (the other being a longer recovery time).

Managing old archive logs on the backup server is your problem and related tools like pg_standby help deal with that. Managing them on the primary server is that server's problem and you shouldn't touch them. You can execute a manual CHECKPOINT at the psql prompt if you want to force this reclaimation to happen (there has to have been some activity since the last checkpoint for this to work which doesn't sound like a problem on your server).

--
* Greg Smith gsmith@xxxxxxxxxxxxx http://www.gregsmith.com Baltimore, MD

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