PGXC_STAT_BGWRITER

Updated on 2024-12-19 GMT+08:00

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PGXC_STAT_BGWRITER displays statistics on the background writer of each node in the cluster. All columns except node_name are the same as those in the PG_STAT_BGWRITER view. This view is accessible only to users with system administrators rights.

**Table 1** **PGXC_STAT_BGWRITER** columns
Name	Type	Description
node_name	text	Node name
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 it had written too many buffers
buffers_backend	bigint	Number of buffers written directly by the 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