Here's an idea and a patch for full page writes improvement. Idea: (1) keep full page writes for ordinary WAL, make them available during the crash recovery, -> recovery from inconsistent pages which can be made at the crash, (2) Remove them from the archive log except for those written during online backup (between pg_start_backup and pg_stop_backup) -> small size archive log.
Implementation: (1) Mark WAL record whose full-page-writes can be removed, (2) Remove full-page writes from the marked WAL record in archive command, and (3) Restore the removed full-page writes to make LSN consistent. Included is a patch for this as well as archive and restore command source. Patch is very small and I hope this to be included in 8.3. -- Koichi Suzuki
pg_lesslog.tar.gz
Description: application/gzip
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