On Wed, Nov 25, 2020 at 01:07:47AM +0000, tsunakawa.ta...@fujitsu.com wrote: > From: Bossart, Nathan <bossa...@amazon.com> >> It may be useful for backups taken with the "consistent snapshot" >> approach. As noted in the documentation [0], running CHECKPOINT >> before taking the snapshot can reduce recovery time. However, users >> might wish to avoid the IO spike caused by an immediate checkpoint. >> >> [0] https://www.postgresql.org/docs/devel/backup-file.html > > Ah, understood. I agree that the slow or spread manual checkpoint is good to > have.
I can see the use case for IMMEDIATE, but I fail to see the use cases for WAIT and FORCE. CHECKPOINT_FORCE is internally implied for the end-of-recovery and shutdown checkpoints. WAIT could be a dangerous thing if disabled, as clients could pile up requests to the checkpointer for no real purpose. -- Michael
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