登录数据库服务器，进入oracle用户下：
[root@uumsnormal-oracle admin]# su - oracle
[oracle@uumsnormal-oracle ~]$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on Mon Jan 4 16:08:27 2016
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
SQL> alter user xx account unlock; --xx为你的用户名，解锁
User altered.
SQL> commit;
Commit complete.
SQL> alter user XX identified by 用户名的密码; --修改密码