Display all child processes and their available connection slots.
PID of Pgpool-II child process.
See pcp_common_options.
If -a nor -P is not specified, process information of all connected Pgpool-II child process will be printed. In this case if there's no connected Pgpool-II child process, nothing but "No process information available" message will be printed.
Here is an example output:
$ pcp_proc_info -p 1100 test postgres 2021-09-28 04:16:00 (4:56 before process restarting) 1 3 0 2021-09-28 04:16:16 2021-09-28 04:16:16 0 2021-09-28 04:16:33 1 30795 0 30750 0 Wait for connection test postgres 2021-09-28 04:16:00 (4:56 before process restarting) 1 3 0 2021-09-28 04:16:16 2021-09-28 04:16:16 0 2021-09-28 04:16:33 1 30796 0 30750 1 Wait for connection test kawamoto 2021-09-28 04:16:00 0 3 0 2021-09-28 04:16:03 2021-09-28 04:16:03 34 (4:26 before client disconnected) 1 30763 1 30751 0 Idle test kawamoto 2021-09-28 04:16:00 0 3 0 2021-09-28 04:16:03 2021-09-28 04:16:03 34 (4:26 before client disconnected) 1 30764 1 30751 1 Idle $ pcp_proc_info -p 11001 30751 test kawamoto 2021-09-28 04:16:00 0 3 0 2021-09-28 04:16:03 2021-09-28 04:16:03 58 (4:02 before client disconnected) 1 30763 1 30751 0 Idle test kawamoto 2021-09-28 04:16:00 0 3 0 2021-09-28 04:16:03 2021-09-28 04:16:03 58 (4:02 before client disconnected) 1 30764 1 30751 1 Idle
The result is in the following order:
1. connected database name
2. connected user name
3. process start-up timestamp (If child_life_time is set not 0, the time before process restarting is displayed.)
4. process-reuse counter for child_max_connections
5. protocol major version
6. protocol minor version
7. connection created timestamp
8. last client connected timestamp
9. client idle duration (sec) (If client_idle_limit is set not 0, the time before client disconnected is displayed.)
10. last client disconnected timestamp
11. connection-reuse counter
12. PostgreSQL backend process id
13. 1 if frontend connected 0 if not
14. pgpool child process id
15. PostgreSQL backend id
16. process status
If -a or --all option is not specified and there is no connection to the backends, nothing will be displayed. If there are multiple connections, one connection's information will be displayed on each line multiple times. Timestamps are displayed in EPOCH format.
The --verbose option can help understand the output. For example:
$ pcp_proc_info -p 11001 --verbose Database : test Username : postgres Start time : 2021-09-28 04:16:00 (2:52 before process restarting) Client connection count : 1 Major : 3 Minor : 0 Backend connection time : 2021-09-28 04:16:16 Client connection time : 2021-09-28 04:16:16 Client idle duration : 0 Client disconnection time : 2021-09-28 04:16:33 Pool Counter : 1 Backend PID : 30795 Connected : 0 PID : 30750 Backend ID : 0 Status : Wait for connection Database : test Username : postgres Start time : 2021-09-28 04:16:00 (2:52 before process restarting) Client connection count : 1 Major : 3 Minor : 0 Backend connection time : 2021-09-28 04:16:16 Client connection time : 2021-09-28 04:16:16 Client idle duration : 0 Client disconnection time : 2021-09-28 04:16:33 Pool Counter : 1 Backend PID : 30796 Connected : 0 PID : 30750 Backend ID : 1 Status : Wait for connection Database : test Username : kawamoto Start time : 2021-09-28 04:16:00 Client connection count : 0 Major : 3 Minor : 0 Backend connection time : 2021-09-28 04:16:03 Client connection time : 2021-09-28 04:16:03 Client idle duration : 158 (2:22 before client disconnected) Client disconnection time : Pool Counter : 1 Backend PID : 30763 Connected : 1 PID : 30751 Backend ID : 0 Status : Idle Database : test Username : kawamoto Start time : 2021-09-28 04:16:00 Client connection count : 0 Major : 3 Minor : 0 Backend connection time : 2021-09-28 04:16:03 Client connection time : 2021-09-28 04:16:03 Client idle duration : 158 (2:22 before client disconnected) Client disconnection time : Pool Counter : 1 Backend PID : 30764 Connected : 1 PID : 30751 Backend ID : 1 Status : Idle