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 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

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

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