Checkpoints and Background Writer (only for PostgreSQL 8.3 and above)

The "Checkpoints and Background Writer" window shows cluster-wide statistics from the background writer. 

Checkpoints

timed number of scheduled checkpoints
req number of requested checkpoints
MaxWritten clean number of times the background writer stopped a cleaning scan because it had written too many buffers

Buffers

Clean buffers written by checkpoints and cleaning scans
Backend buffers written by backends (that is, not by the background writer)
Alloc total buffers allocated

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