使用例です。
    test=# SELECT * FROM pcp_pool_status('localhost',11001,'t-ishii','t-ishii') WHERE item ~ 'backend.*0';
    item           |                     value                      |          description
    -------------------------+------------------------------------------------+-------------------------------
    backend_hostname0       | /tmp                                           | backend #0 hostname
    backend_port0           | 11002                                          | backend #0 port number
    backend_weight0         | 0.500000                                       | weight of backend #0
    backend_data_directory0 | /home/t-ishii/work/pgpool-II/current/aaa/data0 | data directory for backend #0
    backend_status0         | 2                                              | status of backend #0
    backend_flag0           | ALLOW_TO_FAILOVER                              | backend #0 flag
    (6 rows)