PG_STAT_ACTIVITY

PG_STAT_ACTIVITY displays information about the current user's queries. If you have the rights of an administrator or the preset role, you can view all information about user queries.

**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	Backend thread ID
lwtid	integer	Lightweight thread ID
usesysid	oid	OID of the user logging in to the backend
usename	name	OID of the user logging 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 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 column will only be non-null for IP connections, and only when log_hostname is enabled.
client_port	integer	TCP port number that the client uses for communication with this backend, or -1 if a Unix socket is used
backend_start	timestamp with time zone	Startup time of the backend process, that is, the time when the client connects to the server.
xact_start	timestamp with time zone	Time when the current transaction was started, or NULL if no transaction is active. If the current query is the first of its transaction, this column is equal to the query_start column.
query_start	timestamp with time zone	Time when the currently active query was started, or if state is not active, when the last query was started
state_change	timestamp with time zone	Time for the last status change
waiting	boolean	The value is t if the backend is waiting for a lock or node. Otherwise, the value is f.
enqueue	text	Queuing status of a statement. Its value can be: waiting in global queue: The statement is queuing in the global concurrent queue. The number of concurrent statements exceeds the value of max_active_statements configured for a single CN. waiting in respool queue: The statement is queuing in the resource pool and the concurrency of simple jobs is limited. The main reason is that the concurrency of simple jobs exceeds the upper limit max_dop of the fast track. waiting in ccn queue: The job is in the CCN queue, which may be global memory queuing, slow lane memory queuing, or concurrent queuing. The scenarios are: The available global memory exceeds the upper limit, the job is queuing in the global memory queue. Concurrent requests on the slow lane in the resource pool exceed the upper limit, which is specified by active_statements. The slow lane memory of the resource pool exceeds the upper limit, that is, the estimated memory of concurrent jobs in the resource pool exceeds the upper limit specified by mem_percent. Empty or no waiting queue: The statement is running.
state	text	Current overall state of this backend. Its value can be: active: The backend is executing queries. idle: The backend is waiting for new client commands. 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 only their own session status. The state information of other accounts is empty.
resource_pool	name	Resource pool used by the user
stmt_type	text	Statement type
query_id	bigint	ID of a query
query	text	Text of the most recent query in this backend If state is active, this column shows the running 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 connection_info)