pg_stat_activity

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.

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`	timestamp with time zone		Time query began execution
`backend_start`	timestamp with time zone		Time backend process was started
`client_addr`	inet		Client address
`client_port`	integer		Client port
`application_name`	text		Client application name
`xact_start`	timestamp with time zone		Transaction start time
`waiting_resource`	boolean		True if waiting for resource allocation, false if not waiting