Enzo D'addario wrote: > Hi All, > > I have a couple of questions regarding On-line backup and point-in-time > recovery (PITR) in the postgres documentation: > > 1.How is it that we can create a tar file of the PG Data directory > whilst postgres is running? Whe pg_xlog archived files contain information to recover any inconsistency in the backup tar file. > 2.What happens with any DB inserts, updates, deletes etc that occur > between the SELECT pg_start_backup() and the end of the tar? > They would be already logged in the WAL files and already applied in the > tarball, do they then get duplicated during log replay in the recover > process? No, the recovery is just like crash recovery and everything comes back clean, but you do have to recover to a time _after_ the end of the backup. If you want to recover to a time during the backup you have to use the previous backup and xlog files. -- Bruce Momjian | http://candle.pha.pa.us pgman@xxxxxxxxxxxxxxxx | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073
