oracle 查死锁

select A.SQL_TEXT,
       B.USERNAME,
       C.OBJECT_ID,
       C.SESSION_ID,
       B.SERIAL#,
       C.ORACLE_USERNAME,
       C.OS_USER_NAME,
       C.Process,
       '''' || C.Session_ID || ',' || B.SERIAL# || ''''
  from v$sql A, v$session B, v$locked_object C
 where A.HASH_VALUE = B.SQL_HASH_VALUE
   and B.SID = C.Session_ID