oracle忘记用户名密码怎样办？？？
一、忘记除SYS、SYSTEM用户之外的用户的登录密码。
用SYS (或SYSTEM)用户登录。
CONN SYS/PASS_WORD AS SYSDBA;
使用如下语句修改用户的密码。
ALTER USER user_name IDENTIFIED BY newpass;
注意：密码不能全是数字。并且不能是数字开头。否则会出现：ORA-00988: 口令缺失或无效
二、忘记SYS用户，或者是SYSTEM用户的密码。
如果是忘记SYSTEM用户的密码，可以用SYS用户登录。然后用ALTER USER 密令
修改密码。
CONN SYS//PASS_WORD AS SYSDBA;
ALTER USER SYSTEM IDENTIFIED BY newpass;
如果是忘记SYS用户的密码，可以用SYSTEM用户登录。然后用ALTER USER 密令
修改密码。
CONN SYSTEM//PASS_WORD ;
ALTER USER SYSTEM IDENTIFIED BY newpass;
三、如果SYS,SYSTEM用户的密码都忘记或是丢失。
这一项尤其重要。
方法一、
可以使用ORAPWD.EXE 工具修改密码。
开始菜单->运行->输入‘CMD’,打开命令提示符窗口，输入如下命令：
orapwd file=D:\oracle\product\10.2.0\db_1\database\pwdctcsys.ora
password=newpass
这个命令重新生成了数据库的密码文件。密码文件的位置在ORACLE_HOME目录下
的\database目录下。 这个密码是修改sys用户的密码。除sys和system其他用户的密码不会改变。
方法二、
1.如果不记得sys用户的密码了，采用如下方法可以修改密码： (1)打开cmd，输入sqlplus /nolog，回车。 (2)输入“conn / as sysdba”; (3)输入“alter user sys identified by 新密码;”（新密码必须以字母开头，另外每条SQL语句后得分号不能忘） 其他用户方式同理
2.(1)在cmd中启动sqlplus；
(2)用sqlplus/as sysdba登录，使其连接到:
OracleDatabase 10g Express Edition Release 10.2.0.1.0 - Production
(3)执行ALTER USER DBSNMP ACCOUNT UNLOCK；
(4) 从新用SQL/PLUS登录，设置用户名、密码；
附：Oracle 10g 默认安装带来的用户名/密码
|
Username |
Password |
Description |
See Also |
|
CTXSYS |
CTXSYS |
The OracleText account |
OracleText Reference |
|
DBSNMP |
DBSNMP |
The account used by the Management Agent component of OracleEnterprise Manager to monitor and manage the database |
OracleEnterprise Manager Grid Control Installation and Basic Configuration |
|
LBACSYS |
LBACSYS |
The OracleLabel Security administrator account |
OracleLabel Security Administrator's Guide |
|
MDDATA |
MDDATA |
The schema used by OracleSpatial for storing Geocoder and router data |
OracleSpatial User's Guide and Reference |
|
MDSYS |
MDSYS |
The Oracle Spatial and OracleinterMedia Locator administrator account |
OracleSpatial User's Guide and Reference |
|
DMSYS |
DMSYS |
The OracleData Mining account. |
OracleData Mining Administrator's Guide OracleData Mining Concepts |
|
OLAPSYS |
MANAGER |
The account used to create OLAP metadata structures. It owns the OLAP Catalog (CWMLite). |
OracleOLAP Application Developer's Guide |
|
ORDPLUGINS |
ORDPLUGINS |
The Oracle interMedia user. Plug-ins supplied by Oracleand third party format plug-ins are installed in this schema. |
OracleinterMedia User's Guide |
|
ORDSYS |
ORDSYS |
The OracleinterMedia administrator account |
OracleinterMedia User's Guide |
|
OUTLN |
OUTLN |
The account that supports plan stability. Plan stability enables you to maintain the same execution plans for the same SQL statements. OUTLN acts as a role to centrally manage metadata associated with stored outlines. |
OracleDatabase Performance Tuning Guide |
|
SI_INFORMTN_SCHEMA |
SI_INFORMTN_SCHEMA |
The account that stores the information views for the SQL/MM Still Image Standard |
OracleinterMedia User's Guide |
|
SYS |
CHANGE_ON_INSTALL |
The account used to perform database administration tasks |
OracleDatabase Administrator's Guide |
|
SYSMAN |
CHANGE_ON_INSTALL |
The account used to perform OracleEnterprise Manager database administration tasks. Note that SYS and SYSTEM can also perform these tasks. |
OracleEnterprise Manager Grid Control Installation and Basic Configuration |
|
SYSTEM |
MANAGER |
Another account used to perform database administration tasks. |
