PG_STAT_BGWRITER

PG_STAT_BGWRITER displays statistics about the background writer process's activity.

**Table 1** PG_STAT_BGWRITER columns
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.