pg_stat_get_backend_activity()
A function reporting a backend's most recent query
pg_stat_get_backend_activity() is a system function reporting the text of a backend's most recent query.
pg_stat_get_backend_activity() was added in PostgreSQL 7.2.
Usage
pg_stat_get_backend_activity (integer) →text
The backend is specified by a backend ID number reported by pg_stat_get_backend_idset(); see below for an execution example.
The value returned by pg_stat_get_backend_activity_start() corresponds to the column query (PostgreSQL 9.1 and earlier: current_query) in pg_stat_activity.
Related functions
The following related functions are also available:
pg_stat_get_backend_activity_start()pg_stat_get_backend_client_addr()pg_stat_get_backend_client_port()pg_stat_get_backend_dbid()pg_stat_get_backend_pid()pg_stat_get_backend_start()pg_stat_get_backend_userid()pg_stat_get_backend_wait_event()pg_stat_get_backend_wait_event_type()pg_stat_get_backend_xact_start()
Change history
- PostgreSQL 7.2
- added (commit 140ddb78)
Examples
Basic usage example for pg_stat_get_backend_activity_start():
postgres=# SELECT pg_stat_get_backend_pid(s.backendid) AS pid,
pg_stat_get_backend_activity(s.backendid) AS query
FROM (SELECT pg_stat_get_backend_idset() AS backendid) AS s;
pid | query
---------+-----------------------------------------------------------------
1451980 |
1451982 |
2072322 | SELECT pg_stat_get_backend_pid(s.backendid) AS pid, +
| pg_stat_get_backend_activity(s.backendid) AS query_start+
| FROM (SELECT pg_stat_get_backend_idset() AS backendid) AS s;
1764534 | SELECT pg_stat_get_backend_pid(s.backendid) AS pid +
| FROM (SELECT pg_stat_get_backend_idset() AS backendid) AS s;
1451978 |
1451977 |
1451979 |
(7 rows)
References
- PostgreSQL documentation: Per-Backend Statistics Functions