Currently the documentation says: A database that is marked datallowconn = false in pg_database is assumed to be properly frozen; the automatic warnings and wraparound protection shutdown do not take such databases into account. Therefore it's up to you to ensure you've correctly frozen a database before you mark it with datallowconn = false. http://www.postgresql.org/docs/8.1/interactive/maintenance.html#VACUUM-FOR-WRAPAROUND When a VACUUM FREEZE is done, does "datvacuumxid = datfrozenxid"? If so, should VACUUM skip warning about any databases that are "datvacuumxid = datfrozenxid and datallowconn = false"?
