Hi James,
Take a look here, in the links you will find many info and real examples for LockManager issues.
Luiz
On Tue, Apr 9, 2024 at 4:08 AM James Pang <jamespang886@xxxxxxxxx> wrote:
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 | | 11Thanks,James
