忘記dba用戶密碼，利用SQLPlus重置dba密碼

1. 打開SQL Plus
2. 輸入用戶名: sys as sysdba
3. 輸入口令：可直接回車
4. 連接到:

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

5. alter user sys identified by admin;

用戶已更改。

6. conn sys/admin as sysdba;

已連接。

7. alter user system identified by manager;

用戶已更改。