怎样查出前台正在发出的sql语句

select user_name,sql_text 

from v$open_cursor 

where sid in (select sid from 

(select sid,serial 

from v$session 

where status=''''ACTIVE''''))

select sid,serial from v$session 

where status=''''ACTIVE''''

SQL> desc v$open_cursor 

名称                    空      类型 

----------------------------- -------

SADDR                           RAW(4) 

SID                             NUMBER 

USER_NAME                       VARCHAR2(30) 

ADDRESS                         RAW(4) 

HASH_VALUE                      NUMBER 

SQL_TEXT                        VARCHAR2(60)