oracle 11g system 用户密码找回

1. 启动sqlplus

2. 请输入用户名:  sqlplus/as sysdba

3. 输入口令: 直接回车

4. 连接到:
   
      oracledatabase 11g enterprise edition release 11.2.0.1.0 - production
   
      with the partitioning, olap, data mining and real application testing options
   
      sql>alter user sys identified by admin;
   
     用户已更改。
     sql> conn sys/admin as sysdba;
     已连接。
   
     sql> alter user system identified by manager;
   
     用户已更改。
   
     就搞定啦！