PGXC_STAT_ACTIVITY¶
PGXC_STAT_ACTIVITY displays information about the query performed by the current user on all the CNs in the current cluster.
Name | Type | Description |
|---|---|---|
coorname | text | Name of the CN in the current cluster |
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 | ID of the backend thread |
lwtid | integer | Lightweight thread ID of the backend thread |
usesysid | oid | OID of the user logging in to the backend |
usename | name | Name 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 time when the last query was started if state is not active |
state_change | timestamp with time zone | Time for the last status change |
waiting | boolean | The value is t if the backend is currently waiting for a lock or node. Otherwise, the value is f. |
enqueue | text | Queuing status of a statement. Its value can be:
|
state | text | Overall state of the backend. Its value can be:
Note Only system administrators can view the session status of their accounts. The state information of other accounts is empty. |
resource_pool | name | Resource pool used by the user |
stmt_type | text | Type of a user statement |
query_id | bigint | ID of a query |
query | text | Text of this backend's most recent query If the state is active, this column shows the executing 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) |
Example¶
Run the following command to view blocked query statements.
SELECT datname,usename,state,query FROM PGXC_STAT_ACTIVITY WHERE waiting = true;
Check the working status of the snapshot thread.
SELECT application_name,backend_start,state_change,state,query FROM PGXC_STAT_ACTIVITY WHERE application_name='WDRSnapshot';
View the running query statements.
SELECT datname,usename,state,pid FROM PGXC_STAT_ACTIVITY;
datname | usename | state | pid
----------+---------+--------+-----------------
gaussdb | Ruby | active | 140298793514752
gaussdb | Ruby | active | 140298718004992
gaussdb | Ruby | idle | 140298650908416
gaussdb | Ruby | idle | 140298625742592
gaussdb | dbadmin | active | 140298575406848
(5 rows)
View the number of session connections that have been used by postgres. 1 indicates the number of session connections that have been used by postgres.
SELECT COUNT(*) FROM PGXC_STAT_ACTIVITY WHERE DATNAME='postgres';
count
-------
1
(1 row)