scott解锁

方法一、用system超级用户登录后，解锁并修改scott密码：alter user scott identified by "123456" account unlock;登录conn scott/1234656;方法二、（1）conn sys/sys as sysdba;//以DBA的身份登录（2）alter user scott account unlock;// 然后解锁（3）conn scott/tiger //弹出一个修改密码的对话框，修改一下密码就可以了