LWLock always shows up in the case where you have too many concurrent
active connections. Do a select from the pg_stat_activity table where
state in ('idle in transaction','active'); Then count how many CPUs you
have. If the sql query count returned is greater than 2-3 times the
number of CPUs, you probably have a CPU overload problem and your
solution may be to add a connection pooler between the client and the DB
server. This is all due to the nature of how PG is architected: every
connection is a process, not a thread.
Regards,
Michael Vitale
James Pang wrote on 4/11/2025 10:36 AM:
pgv14.8 , during peak time, we suddenly see hundreds of active
sessions waiting on LWlock WALWrite at the same time, but we did not
find any issue on storage .
any suggestions ?
Thanks,
James
Regards,
Michael Vitale
michael...@sqlexec.com <mailto:michaelvit...@sqlexec.com>
703-600-9343
