--查用户名，查客户端机器

SELECT distinct  s.username,s.MACHINE, s.sid||','||s.serial#

    FROM gv$session s, gv$lock l, dba_objects o

   WHERE l.sid = s.sid

     AND l.id1 = o.object_id(+)

     AND s.username is NOT NULL

      and s.MACHINE = 'WORKGROUP\PC-201301201414'

--这个SQL可以查看哪个用户用什么方式锁住了哪些表,使用的哪个Session。

SELECT   s.username,S.MACHINE,s.SQL_EXEC_START,

         decode(l.type, 'TM', 'TABLE LOCK', 'TX', 'ROW LOCK', NULL) LOCK_LEVEL,

         o.owner,

         o.object_name,

         o.object_type,

         s.sid,

         s.serial#,

         s.sid||','||s.serial#

    FROM gv$session s, gv$lock l, dba_objects o

   WHERE l.sid = s.sid

     AND l.id1 = o.object_id(+)

     AND s.username is NOT NULL

     AND (s.username='' or s.username = 'TPSC_TEST' or s.username = '') --'TPSC'   TPSC_TEST  --必须要大写