On Fri, 2009-05-15 at 14:56 +0300, Heikki Linnakangas wrote: > Simon's idea of keeping a copy of all the history files in the data > directory wouldn't help here. In fact, I think we already never delete > history files in the server, it's just that if you omit the pg_xlog > directory in the base backup they won't be included. But even if they > are included in the base backup, that wouldn't help in this scenario > because the base backup still wouldn't contain the history files for the > later timelines.
You're right there. That still leaves the problem that we need to know the later history, even if we don't use it. > If you delete history file and all the WAL for timeline 6, yeah, nothing > stops it from being reused. It will work just fine, as if it never > existed. If you still have the history file and WAL for the old timeline > 6 lying around somewhere else like an older offsite backup, it's easy > for the administrator to get confused, but there isn't much we can do > about that. ehem, "It will work fine" isn't correct, as Fujii-san observes. Let's document that timeline files should not be deleted from the archive iff there exists a base backup made during a lower numbered timeline. -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
