On Wed, 2021-05-05 at 11:25 -0500, Don Seiler wrote: > What I want to know is if there are other events that would contribute > to a WALWriteLock (eg writing to a data file or the postgresql.log file) > or is it 100% writing to the WAL file. You don't contribute to a lock... The documentation says (https://www.postgresql.org/docs/13/monitoring-stats.html#WAIT-EVENT-LOCK-TABLE): > WALWrite Waiting for WAL buffers to be written to disk. So it is contention while writing or flushing WAL. You can read the code for the details. Yours, Laurenz Albe -- Cybertec | https://www.cybertec-postgresql.com
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