postgresql查询正则执行的SQL和函数

SELECT procpid, start, now() - start AS lap,  current_query FROM
(SELECT
backendid,
pg_stat_get_backend_pid(S.backendid) AS procpid,
pg_stat_get_backend_activity_start(S.backendid) AS start,
pg_stat_get_backend_activity(S.backendid) AS current_query
FROM
(SELECT pg_stat_get_backend_idset() AS backendid) AS S
) AS S
WHERE
current_query <> '<IDLE>'
ORDER BY
lap DESC;

procpid：进程id

start：进程开始时间

lap：经过时间

current_query：执行中的sql

怎样停止正在执行的sql

SELECT pg_cancel_backend(进程id);

或者用系统函数 kill -9 进程id; 每个查询开一个进程