current_catalog
current_database
current_query
current_schema
current_schemas
current_user
inet_client_addr
inet_client_port
inet_server_addr
inet_server_port
pg_backend_pid
pg_conf_load_time
pg_is_other_temp_schema
pg_listening_channels
pg_my_temp_schema
pg_postmaster_start_time
pg_trigger_depth
session_user
user
version
pg_sleep