oracle 查找最消耗内存cpu的进程的sql

SELECT sql_text
  FROM v$sqltext a
WHERE (a.hash_value, a.address) IN
       (SELECT DECODE(sql_hash_value, 0, prev_hash_value, sql_hash_value),
               DECODE(sql_hash_value, 0, prev_sql_addr, sql_address)
          FROM v$session b
         WHERE b.paddr = (SELECT addr FROM v$process c WHERE c.spid = '$pid))
ORDER BY piece ASC