pg_stat_activity

The view pg_stat_activity shows one row per server process with details about the associated user session and query. The columns that report data on the current query are available unless the parameter stats_command_string has been turned off. Furthermore, these columns are only visible if the user examining the view is a superuser or the same as the user owning the process being reported on.

The maximum length of the query text string stored in the column current_query can be controlled with the server configuration parameter pgstat_track_activity_query_size.

column	type	references	description
datid	oid	pg_database.oid	Database OID
datname	name		Database name
procpid	integer		Process ID of the server process
sess_id	integer		Session ID
usesysid	oid	pg_authid.oid	Role OID
usename	name		Role name
current_query	text		Current query that process is running
waiting	boolean		True if waiting on a lock, false if not waiting
query_start	timestamptz		Time query began execution
backend_start	timestamptz		Time backend process was started
client_addr	inet		Client address
client_port	integer		Client port
application_name	text		Client application name
xact_start	timestamptz		Transaction start time
waiting_reason	text		Reason the server process is waiting. The value can be:lock, replication, or resgroup
rsgid	oid	pg_resgroup.oid	Resource group OID or 0 See Note.
rsgname	text	pg_resgroup.rsgname	Resource group name or unknown. See Note.
rsgqueueduration	interval		For a queued query, the total time the query has been queued.

Note: When resource groups are enabled. Only query dispatcher (QD) processes will have a rsgid and rsgname. Other server processes such as a query executer (QE) process or session connection processes will have a rsgid value of 0 and a rsgname value of unknown. QE processes are managed by the same resource group as the dispatching QD process.

Parent topic: System Catalogs Definitions