we found sometimes , with many sessions running same query "select ..." at the same time, saw many sessions waiting on "LockManager". for example, pg_stat_activity show. It's a production server, so no enable trace_lwlocks flag. could you direct me what's the possible reason and how to reduce this "lockmanager" lock? all the sql statement are "select " ,no DML.
time wait_event count(pid)
2024-04-08 09:00:06.043996+00 | DataFileRead | 42
2024-04-08 09:00:06.043996+00 | | 15
2024-04-08 09:00:06.043996+00 | LockManager | 31
2024-04-08 09:00:06.043996+00 | BufferMapping | 46
2024-04-08 09:00:07.114015+00 | LockManager | 43
2024-04-08 09:00:07.114015+00 | DataFileRead | 28
2024-04-08 09:00:07.114015+00 | ClientRead | 11
2024-04-08 09:00:07.114015+00 | | 11
Thanks,
James