On Thu, Jul 28, 2022 at 11:50 AM Harinath Kanchu <hkan...@apple.com> wrote: > > Greetings, > > > When we take backups from a synchronous standby replica, how can we get the > accurate timestamp of the backup end time ? (As backup history files are not > generated on standbys)For example: > this is a part of control file after a backup (created using wal-g by calling > pg_startbackup and pg_stopbackup), > > Fake LSN counter for unlogged rels: 0/3E8 > Minimum recovery ending location: 28/28000B68 > Min recovery ending loc's timeline: 2 > Backup start location: 0/0 > Backup end location: 0/0 > End-of-backup record required: no > > here I can see that minimum recovery ending location as LSN value, how can we > get the timestamp of it ?The backup label file looks like this. > > INFO: 2022/07/26 23:25:23.850621 ------------ LABLE FILE START ---------- > INFO: 2022/07/26 23:25:23.850628 START WAL LOCATION: 1D/F94C7320 (file > 000000020000001D000000F9) > INFO: 2022/07/26 23:25:23.850633 CHECKPOINT LOCATION: 1E/EDA8700 > INFO: 2022/07/26 23:25:23.850639 BACKUP METHOD: streamed > INFO: 2022/07/26 23:25:23.850645 BACKUP FROM: standby > INFO: 2022/07/26 23:25:23.850653 START TIME: 2022-07-26 23:10:27 GMT > INFO: 2022/07/26 23:25:23.850659 LABEL: 2022-07-26 23:10:27.545378 +0000 UTC > m=+0.167723956 > INFO: 2022/07/26 23:25:23.850665 START TIMELINE: 2 > INFO: 2022/07/26 23:25:23.850669 > INFO: 2022/07/26 23:25:23.850676 ------------ LABLE FILE END ---------- > > > How can we do PITR using timestamp if we don’t know the accurate timestamp of > minimum recovery point ?
You can use any of the methods specified in the other thread [1]. Otherwise, you can as well use recovery_target_lsn = min_recovery_point for PITR target instead of relying on timestamps. I believe the other thread [1] can be merged into this thread for a focussed, use-case based and meaningful discussion. [1] https://www.postgresql.org/message-id/CALj2ACVgFvOQQEoyuuZeceQrStGsePWvU1noU5aAvJNenv8qTQ%40mail.gma -- Bharath Rupireddy RDS Open Source Databases: https://aws.amazon.com/
