Some time ago I reported bug 6291, which reported a Xid wraparound, both as reported in pg_controldata and by txid_current_snapshot. Unfortunately, nobody could reproduce it.
Today, the same system of ours just passed the wraparound mark successfully at this time, incrementing the epoch. However, two standbys have not done the same: they have wrapped to a low txid. At this time, pg_controldata does report the correct epoch, as I read it, unlike the original case. I have not yet tried to reproduce this in a minimal way, but I wanted to relate this information as soon as possible. These systems are 9.0.6, on Ubuntu 10.04 LTS, amd64. : http://archives.postgresql.org/pgsql-bugs/2011-11/msg00094.php -- fdr -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers