PG_STAT_BGWRITER¶
PG_STAT_BGWRITER displays statistics about the background writer process's activity.
Name | Type | Description |
|---|---|---|
checkpoints_timed | bigint | Number of scheduled checkpoints that have been performed |
checkpoints_req | bigint | Number of requested checkpoints that have been performed |
checkpoint_write_time | double precision | Total amount of time that has been spent in the portion of checkpoint processing where files are written to disk, in milliseconds |
checkpoint_sync_time | double precision | Total amount of time that has been spent in the portion of checkpoint processing where files are synchronized to disk, in milliseconds |
buffers_checkpoint | bigint | Number of buffers written during checkpoints |
buffers_clean | bigint | Number of buffers written by the background writer |
maxwritten_clean | bigint | Number of times the background writer stopped a cleaning scan because it had written too many buffers |
buffers_backend | bigint | Number of buffers written directly by a backend |
buffers_backend_fsync | bigint | Number of times that a backend has to execute fsync |
buffers_alloc | bigint | Number of buffers allocated |
stats_reset | timestamp with time zone | Time at which these statistics were reset |