Updated on 2024-05-07 GMT+08:00

PGXC_STAT_ACTIVITY

PGXC_STAT_ACTIVITY displays information about the current user's queries on all CNs in the current cluster. Only users with the monitor admin or sysadmin permission can view the view.

Table 1 PGXC_STAT_ACTIVITY columns

Name

Type

Description

coorname

text

Name of a CN in the current cluster.

datid

oid

OID of the database that the user session connects to in the backend.

datname

text

Name of the database that the user session connects to in the backend.

pid

bigint

Backend thread ID.

sessionid

bigint

Session ID.

usesysid

oid

OID of the user logged in to the backend.

usename

text

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, either the client is connected via a Unix socket on the server machine 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 process was started, that is, when the client connected to the server.

xact_start

timestamp with time zone

Time when the current 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 currently active query was started, or if state is not active, when the last query was started.

state_change

timestamp with time zone

Time when state was last changed.

waiting

boolean

Specifies whether the backend is currently waiting for a lock. If yes, the value is true. Otherwise, the value is false.

enqueue

text

Queuing status of a statement. Its value can be:
  • waiting in queue: The statement is in the queue.
  • Empty: The statement is running.

state

text

Overall status of this backend. Its value can be:
  • 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:

Only system administrators can view the session status of their accounts. 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 pgxc_stat_activity is empty.

SELECT datname, usename, usesysid, state,pid FROM pgxc_stat_activity;
 datname  | usename | usesysid | state  |       pid
----------+---------+----------+--------+-----------------
 testdb | omm     |       10 |        | 139968752121616
 testdb | omm     |       10 |        | 139968903116560
 db_tpcds | 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 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.

global_sessionid

text

Global session ID.

unique_sql_id

bigint

Unique SQL statement ID.

trace_id

text

Driver-specific trace ID, which is associated with an application request.