checkpoint_flush_after
A configuration parameter to force the OS to write data accumulated during a checkpoint to storage
checkpoint_flush_after is a configuration parameter which forces the OS (typically Linux) to write the specified amount of data accumulated during a checkpoint to underlying storage. This reduces the risk of I/O stalls if the OS writes larger batches of data in the background, or during the fsync operation at the end of the checkpoint.
checkpoint_flush_after was added in PostgreSQL 9.6.
Default value
The default value for is checkpoint_flush_after: 256kB (Linux), otherwise 0.
Change history
- PostgreSQL 9.6
- added (commit 428b1d6b)
References
- PostgreSQL documentation: checkpoint_flush_after
Categories
See also
checkpoint, checkpoint_completion_target, backend_flush_after, bgwriter_flush_after