数据库是否有锁存在

• SELECT l.session_id sid, s.serial#, l.locked_mode,l.oracle_username,l.os_user_name,s.machine, s.terminal, o.object_name, s.logon_time
  FROM v$locked_object l, all_objects o, v$session s
  WHERE l.object_id = o.object_id AND l.session_id = s.sid
  ORDER BY sid, s.serial# ;

   

   

   
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  这个语句用来查数据库是否有锁存在