I just want to confirm that the cluster/MVCC issues are due to transaction visibility. Assuming that no concurrent access is happening to a given table when the cluster command is issued (when takes it visibility snapshot), it is safe to cluster that table. Correct? -- Brad Nicholson 416-673-4106 Database Administrator, Afilias Canada Corp. ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org/