安装完oracle 11g，过了好久才用，已经忘了初始化的用户名和密码了，怎么办？

录入 sqlplus /nolog 无用户名登录

conn /as sysdba 连接到数据本地数据

alter user system identified by password; 修改System 密码 为password

或者打开sqlplus软件: 

窗口用户名录入:/nolog 

D:\oracle\ora92\bin>sqlplus /nolog

SQL*Plus: Release 9.2.0.1.0 - Production on 星期四 8月 16 11:32:22 2007

Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.

SQL> conn /as sysdba
已连接。
SQL> alter user system identified by password;

用户已更改。

SQL> alter user sys identified by password;

用户已更改。

SQL> alter user system identified by manger;

解锁方法
alter user system account unlock;

 这样密码修改成功了

 分配用户名和密码

CREATE USER username（用户名） IDENTIFIED BY password(密码);

grant create session to EPM;
grant create table to EPM;
grant create tablespace to EPM;
grant create view to EPM;
grant connect,resource,dba to EPM;

jdbc:oracle:thin:@192.168.XXX.XXX(IP):1521:实例名
用户 username ;密码 password;

select * from usr_zsj.v_user_to_bdcom;