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
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