ORA-01940: cannot drop a user that is currently connected

删除用户的时候，出现ora-01940错误

SQL> drop user xx;

drop user xx

*

ERROR at line 1:

ORA-01940: cannot drop a user that is currently connected

SQL> select sid,serial# from v$session

  2  where username='XX';

       SID    SERIAL#

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

       136         33

SQL> alter system kill session '136,33';