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 query can be controlled with the server configuration parameter track_activity_query_size.

column	type	references	description
datid	oid	pg_database.oid	Database OID
datname	name		Database name
pid	integer		Process ID of this backend
sess_id	integer		Session ID
usesysid	oid	pg_authid.oid	OID of the user logged into this backend
usename	name		Name of the user logged into this backend
application_name	text		Name of the application that is connected to this backend
client_addr	inet		IP address of the client connected to this backend. If this field is null, it indicates either that the client is connected via a Unix socket on the server machine or that this is an internal process such as autovacuum.
client_hostname	text		Host name of the connected client, as reported by a reverse DNS lookup of client_addr. This field will only be non-null for IP connections, and only when log_hostname is enabled.
client_port	integer		TCP port number that the client is using for communication with this backend, or -1 if a Unix socket is used
backend_start	timestamptz		Time backend process was started
xact_start	timestamptz		Transaction start time
query_start	timestamptz		Time query began execution
state_change	timestampz		Time when the state was last changed
waiting	boolean		True if waiting on a lock, false if not waiting
state	text		Current overall state of this backend. Possible values are: - active: The backend is running a query. - idle: The backend is waiting for a new client command. - idle in transaction: The backend is in a transaction, but is not currently running a query. - idle in transaction (aborted): This state is similar to idle in transaction, except one of the statements in the transaction caused an error. - fastpath function call: The backend is running a fast-path function. - disabled: This state is reported if track_activities is deactivated in this backend.
query	text		Text of this backend's most recent query. If state is active this field shows the currently running query. In all other states, it shows the last query that was run.
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 on rsgid and rsgname

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