PG_STAT_BGWRITER
PG_STAT_BGWRITER displays statistics about the background writer process's activity.
| Column | 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 | Time spent on writing files to the disk during checkpoints, in milliseconds. |
| checkpoint_sync_time | Double precision | Time spent on synchronizing data to the disk during checkpoints, 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 too many buffers were written. |
| buffers_backend | Bigint | Number of buffers written directly by a backend |
| buffers_backend_fsync | Bigint | Number of times that the 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. |
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