BGWRITER_STAT
BGWRITER_STAT displays statistics about the background writer process's activities.
| 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 time that has been spent in the portion of checkpoint processing where files are written to disk (unit: ms) |
| checkpoint_sync_time | double precision | Total time that has been spent in the portion of checkpoint processing where files are synchronized to disk (unit: ms) |
| 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 the backend |
| buffers_backend_fsync | bigint | Number of times the backend had to execute its own fsync call (normally the background writer handles those even when the backend does its own write) |
| buffers_alloc | bigint | Number of buffers allocated |
| stats_reset | timestamp with time zone | Time at which these statistics were last reset |
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