On Tue, Oct 09, 2018 at 03:26:35PM +0800, magodo wrote: > Yes, but does this differ whether I'm archiving a general WAL or > archiving the backup history? I mean if user doesn't handle duplicate > archive, then pg_wal will still be filled up when archiving WAL. A WAL segment has a unique name, and would be finished to be used once. The problem with backup history files on standbys is that the *same* file can could finish by being generated *multiple* times with base backups taken in parallel. That's a completely different story, and the window to those backup history files having the same name gets larger the more the window between two checkpoints is. That's a problem I studied a couple of months back. -- Michael
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