Determines the number of WAL append buffers allocated by the File System.
Field Group
File System
Valid Range
5 through 40
Default
20
Changes Take Effect
After the next database restart.
Usage Notes
A larger number of buffers increases the chance that there will be an available buffer to hold a WAL log record when a task needs to append a WAL log record.
A smaller number of buffers risks that buffers may be unavailable because they are full and writes are pending.