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The view pg_stat_activity shows one row per server process and details about it 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 sting stored in the column current_query can be controlled with the server configuration parameter pgstat_track_activity_query_size.

Table 1. pg_catalog.pg_stat_activity
column type references description
datid oid pg_database.oid Database OID
datname name   Database name
procpid integer   Process ID of the server process
sess_id integer   Session ID
usesysid oid pg_authid.oid Role OID
usename name   Role name
current_query text   Current query that process is running
waiting boolean   True if waiting on a lock, false if not waiting
query_start timestamptz   Time query began execution
backend_start timestamptz   Time backend process was started
client_addr inet   Client address
client_port integer   Client port
application_name text   Client application name
xact_start timestamptz   Transaction start time
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
rsgname text pg_resgroup.rsgname Resource group name
rsgqueueduration interval   For a queued query, the total time the query has been queued.