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  5. PG_STAT_ACTIVITY

PG_STAT_ACTIVITY

PG_STAT_ACTIVITY shows information about the current user's 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

Process ID of the backend

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

Time when this process was started, that is, when the client connected to the server

xact_start

timestamp with time zone

Time when 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 when the status was changed in the previous time

waiting

Boolean

Whether the backend is currently waiting on a lock. If it is, its value is true.

enqueue

text

Workload management resource status

state

text

Current overall state 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 is not currently executing a query.
  • idle in transaction (aborted): This state is similar to idle in transaction, except that one of the statements in the transaction caused an error.
  • 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. 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
----------+---------+----------+--------+-----------------
 postgres | omm     |       10 |        | 139968752121616
 postgres | omm     |       10 |        | 139968903116560
 db_tpcds | judy    |    16398 | active | 139968391403280
 postgres | omm     |       10 |        | 139968643069712
 postgres | omm     |       10 |        | 139968680818448
 postgres | joe     |    16390 |        | 139968563377936
(6 rows)

resource_pool

name

Resource pool used by the user

query_id

bigint

ID of a query

query

text

Text of this backend's most recent query If state is active, this column shows the executing query. In all other states, it shows the last query that was executed.