oracle 11g 安装后默认密码
安装ORACLE时，若没有为下列用户重设密码，则其默认密码如下： 用户名 / 密码 登录身份 说明 sys/change_on_install SYSDBA 或 SYSOPER 不能以 NORMAL 登录，可作为默认的系统管理员 system/manager SYSDBA 或 NORMAL 不能以 SYSOPER 登录，可作为默认的系统
安装ORACLE时，若没有为下列用户重设密码，则其默认密码如下：
用户名 / 密码 登录身份 说明
sys/change_on_install SYSDBA 或 SYSOPER 不能以 NORMAL 登录，可作为默认的系统管理员
system/manager SYSDBA 或 NORMAL 不能以 SYSOPER 登录，可作为默认的系统管理员
sysman/oem_temp sysman 为 oms 的用户名
scott/tiger NORMAL 普通用户
aqadm /aqadm SYSDBA 或 NORMAL 高级队列管理员
Dbsnmp/dbsnmp SYSDBA 或 NORMAL 复制管理员
登录身份：指登录时的Role指定，oracle11g中分SYSDBA和default两种。
PS：在安装Oracle 10g的时候，提示创建数据库，在创建的同时提示你输入口令，若此时你输入了密码，在登录数据库的时候用户名sys 对应的密码就应该是你创建数据库时候输入的口令。而非默认的manager.
如默认密码不对，可手动修改
首先启动sqlplus
输入用户名：sqlplus / as sydba
密码空缺
如果用户被锁定，记得加上
SQL> alter user sys account unlock;
User altered.
然后修改密码
SQL> alter user sys identified by manager;
User altered.
现在就可以用用户名：sys 密码：manager 登录了。
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