Faster Point In Time Recovery (PITR) In PostgreSQL Using A Delayed Standby [HOT]
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When log_checkpoints is set to on (the default), the PostgreSQL server will write all checkpointed WAL records to disk as they occur. This saves time, but consumes disk space. If the allocated space on disk for a wal archive file is bigger than the amount of data in the most recent snapshot, the oldest parts of the WAL records will be left over and not included in the archive file, even if they will be overwritten by new WAL records. If you need to online pg_archivecleanup, you must specify the target filename when calling it, so that the cleanup will not reuse the WAL segments at the end of the archive.
The support for archive recovery for older snapshot architectures is to use the new PITR recovery model. This will all the WAL records up to the strate point where the pg_archivecleanup command is run. The next step in the recovery process is to roll back the replica to the point just before the pg_archivecleanup command was run, and then execute a PITR recovery in order to recover the WAL tail after that point. This means that the new pair of time stamp and WAL file prefix are stored in the archive, and are available for later use in a new replica. d2c66b5586