怎样找回 oracle 忘记的sys system 密码

1.设置sqlnet.ora文件中的SQLNET.AUTHENTICATION_SERVICES= (NTS)

把在这行前面加"#"注释去掉即可
2.以sysdba权限，连接到数据库
[oracle@as4forora ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on Wed Jul 16 21:48:18 2008

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

3.更改sys及system密码
SQL> alter user sys identified by wu1982$;

User altered.

SQL> alter user system identified by bo1982#;

User altered.