text: --锁表查询SQLSELECT object_name, machine, s.sid, s.serial#
  FROM gv$locked_object l, dba_objects o, gv$session s
  WHERE l.object_id　= o.object_id
  AND l.session_id = s.sid;
  
  --释放SESSION SQL:
  --alter system kill session 'sid, serial#';
  ALTER system kill session '23, 1647' ;