PG_STAT_ACTIVITY

PG_STAT_ACTIVITY displays information about the current user's queries. The columns save information about the last query.

**Table 1** PG_STAT_ACTIVITY columns
Name	Type	Description
datid	oid	OID of the database that the user session connects to in the backend.
datname	name	Name of the database that the user session connects to in the backend.
pid	bigint	ID of the backend thread.
sessionid	bigint	Session ID.
usesysid	oid	OID of the user logged in to the backend.
usename	name	Name of the user logged in to the backend.
application_name	text	Name of the application connected to the backend.
client_addr	inet	IP address of the client connected to the backend. If this column is NULL, it indicates either the client is connected through a Unix socket on the server or 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 column will be non-null only for IP connections and only when log_hostname is enabled.
client_port	integer	TCP port number that the client uses for communication with the backend (–1 if a Unix socket is used)
backend_start	timestamp with time zone	Time when this session was started, that is, when the client connected to the server.
xact_start	timestamp with time zone	Time when the current active transaction was started (NULL if no transaction is active). If the current query is the first of its transaction, the value of this column is the same as that of the query_start column.
query_start	timestamp with time zone	Time when the current active query was started, or time when the last query was started if the value of state is not active. For a stored procedure, function, or package, the first query time is displayed and does not change with the running of statements in the stored procedure.
state_change	timestamp with time zone	Time when state was last modified.
waiting	Boolean	Whether the backend is currently waiting for a lock. If yes, the value is true.
enqueue	text	Unsupported currently.
state	text	Overall status of the backend. The value must be one of the following: active: The backend is executing a query. idle: The backend is waiting for a new client command. idle in transaction: The backend is in a transaction, but there is no statement being executed in the transaction. idle in transaction (aborted): The backend is in a transaction, but there are statements failed in the transaction. fastpath function call: The backend is executing a fast-path function. disabled: This state is reported if track_activities is disabled in this backend. NOTE: Common users can view their own session status only. The state information of other accounts is empty. For example, after user judy is connected to the database, the state information of user joe and the initial user omm in pg_stat_activity is empty. SELECT datname, usename, usesysid, state,pid FROM pg_stat_activity; datname \| usename \| usesysid \| state \| pid ----------+---------+----------+--------+----------------- testdb \| omm \| 10 \| \| 139968752121616 testdb \| omm \| 10 \| \| 139968903116560 db_tpcc \| judy \| 16398 \| active \| 139968391403280 testdb \| omm \| 10 \| \| 139968643069712 testdb \| omm \| 10 \| \| 139968680818448 testdb \| joe \| 16390 \| \| 139968563377936 (6 rows)
resource_pool	name	Resource pool used by the user.
query_id	bigint	ID of a query.
query	text	Latest query at the backend. If the value of state is active, this column shows the ongoing query. In all other states, it shows the last query that was executed.
connection_info	text	A string in JSON format recording the driver type, driver version, driver deployment path, and process owner of the connected database. For details, see the GUC parameter connection_info.
unique_sql_id	bigint	Unique SQL statement ID.
trace_id	text	Driver-specific trace ID, which is associated with an application request.
top_xid	xid	Top-level transaction ID of a transaction.
current_xid	xid	Current transaction ID of a transaction.
xlog_quantity	bigint	Amount of Xlogs currently used by a transaction, in bytes.