postgresql查詢正則執行的SQL和函數

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：進程id
• start：進程開始時間
• lap：通過時間
• current_query：執行中的sql
• 怎樣中止正在執行的sql
• SELECT pg_cancel_backend(進程id);
• 或者用系統函數 kill -9 進程id; 每一個查詢開一個進程