Hi
a query is stuck with the above, it seems it waits for parallel worker to finish, however , there are no parallel works running :
postgres@[local]/dynacom=#
SELECT application_name, backend_type,
backend_start,xact_start,query_start,wait_event_type,
wait_event ,state FROM pg_stat_activity;
application_name | backend_type |
backend_start | xact_start |
query_start | wait_event_type | wait_event
| state
------------------+------------------------------+-------------------------------+-------------------------------+-------------------------------+-----------------+---------------------+--------
| autovacuum launcher | 2024-11-29
17:48:50.92935+02 | |
| Activity | AutoVacuumMain
|
| logical replication launcher | 2024-11-29
17:48:50.929496+02 | |
| Activity |
LogicalLauncherMain |
DBMIRROR | client backend | 2025-05-31
19:04:16.724305+03 | 2025-05-31 19:05:21.686093+03 | 2025-05-31
19:05:21.909936+03 | IPC | ParallelFinish |
active
| client backend | 2025-05-31
23:31:30.030806+03 | | 2025-05-31
23:35:05.045573+03 | Client | ClientRead |
idle
psql | client backend | 2025-05-31
23:29:33.863485+03 | 2025-05-31 23:35:09.322972+03 | 2025-05-31
23:35:09.322972+03 | | |
active
RXMLFVSLS | client backend | 2025-05-31
23:32:37.351131+03 | | 2025-05-31
23:35:09.295221+03 | Client | ClientRead |
idle
psql | client backend | 2025-04-28
16:59:55.968442+03 | | 2025-05-27
16:43:56.338228+03 | Client | ClientRead |
idle
| background writer | 2024-11-29
17:48:50.916876+02 | |
| Activity | BgWriterMain
|
| archiver | 2024-12-03
18:57:36.447067+02 | |
| Activity | ArchiverMain
|
| checkpointer | 2024-11-29
17:48:50.916648+02 | |
| Activity |
CheckpointerMain |
| walwriter | 2024-11-29
17:48:50.928789+02 | |
| Activity | WalWriterMain
|
(11 rows)
postgres@[local]/dynacom=#
So, I will terminate this backend now to get the system working again, we are curious why this happened, our system serves daily 22M+ transactions, this is Saturday night hence the low traffic.
postgres@smadb:~$ lsb_release
-a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 12 (bookworm)
Release: 12
Codename: bookworm
postgres@smadb:~$ psql -Aqt -c
'select version()'
PostgreSQL 16.6 on x86_64-pc-linux-gnu, compiled by gcc (Debian
12.2.0-14) 12.2.0, 64-bit
postgres@smadb:~$
