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v1.1

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BGWRITER_STAT

BGWRITER_STAT displays statistics about the background writer process's activities.

Table 1 BGWRITER_STAT columns

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 a backend
buffers_backend_fsync bigint Number of times a 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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