Help Center/ GaussDB/ Developer Guide(Distributed_V2.0-8.x)/ System Catalogs and System Views/ System Views/ VACUUM/ PG_STAT_ACTIVITY
Updated on 2025-05-29 GMT+08:00
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PG_STAT_ACTIVITY

PG_STAT_ACTIVITY displays information about the current user's queries. The columns save information about the last query. This view displays the table that is being cleared by the current worker. The columns are described as follows:

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.

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 that either the client is connected via a UDS 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 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 the backend (–1 if a Unix socket is used).

backend_start

timestamp with time zone

Start time of the process when the client connects to the server.

xact_start

timestamp with time zone

Time when the current transaction is 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

Start time of the active query. If state is not active, the start time of the previous query is queried. For a stored procedure, function, or package, the first query time is queried 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

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

enqueue

text

Unsupported currently.

state

text

Overall status of this backend. Values are as follows:

  • 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.

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 "connection_info" in "Configuring GUC Parameters > GUC Parameters > Connection and Authentication > Connection Settings" in Administrator Guide.)

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.

The running result is as follows:

gaussdb=# select * from pg_stat_activity where query ilike '%vacuum%' and query not like 'select%';
 datid | datname  |       pid       |    sessionid    | usesysid |  usename  | application_name | client_addr | client_hostname | client_port |         backend_st
art         |          xact_start           |          query_start          |         state_change          | waiting | enqueue | state  | resource_pool |     que
ry_id     |     query     |                                                                       connection_info
                      | unique_sql_id | trace_id | top_xid | current_xid | xlog_quantity
-------+----------+-----------------+-----------------+----------+-----------+------------------+-------------+-----------------+-------------+-------------------
------------+-------------------------------+-------------------------------+-------------------------------+---------+---------+--------+---------------+--------
----------+---------------+---------------------------------------------------------------------------------------------------------------------------------------
----------------------+---------------+----------+---------+-------------+---------------
 12912 | postgres | 140123447490304 | 140123447490304 |       10 | postgres | gsql             |             |                 |          -1 | 2025-02-09 10:13:3
0.726384-05 | 2025-02-09 10:13:30.761649-05 | 2025-02-09 10:13:30.761649-05 | 2025-02-09 10:13:30.761654-05 | f       |         | active | default_pool  | 3096224
743913390 | vacuum freeze | {"driver_name":"libpq","driver_version":"(GaussDB Kernel 505.2.1.SPC0100 build 1dc713e2) compiled at 2025-02-08 15:32:13 commit 10212
last mr 22203 debug"} |    2396388490 |          |       0 |           0 |             0
(1 row)
Parent topic: VACUUM