oracle忘记用户名密码怎样办
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：
orapwdfile=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:
Oracle Database 10g Express EditionRelease 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 Oracle Textaccount |
Oracle TextReference |
| DBSNMP |
DBSNMP |
The account used by the Management Agent componentof Oracle EnterpriseManager to monitor and manage the database |
Oracle Enterprise Manager GridControl Installation and Basic Configuration |
| LBACSYS |
LBACSYS |
The Oracle LabelSecurity administrator account |
Oracle LabelSecurity Administrator's Guide |
| MDDATA |
MDDATA |
The schema usedby Oracle Spatialfor storing Geocoder and router data |
Oracle SpatialUser's Guide and Reference |
| MDSYS |
MDSYS |
The Oracle Spatialand Oracle interMediaLocator administrator account |
Oracle SpatialUser's Guide and Reference |
| DMSYS |
DMSYS |
The Oracle DataMining account. |
Oracle DataMining Administrator's Guide Oracle DataMining Concepts |
| OLAPSYS |
MANAGER |
The account used to create OLAP metadatastructures. It owns the OLAP Catalog (CWMLite). |
Oracle OLAPApplication Developer's Guide |
| ORDPLUGINS |
ORDPLUGINS |
The Oracle interMediauser. Plug-ins suppliedby Oracle andthird party format plug-ins are installed in this schema. |
Oracle interMedia User'sGuide |
| ORDSYS |
ORDSYS |
The Oracle interMediaadministrator account |
Oracle interMedia User'sGuide |
| OUTLN |
OUTLN |
The account that supports plan stability. Planstability enables you to maintain the same execution plans for thesame SQL statements. OUTLN acts as a role to centrally managemetadata associated with stored outlines. |
Oracle Database PerformanceTuning Guide |
| SI_INFORMTN_SCHEMA |
SI_INFORMTN_SCHEMA |
The account that stores the information views forthe SQL/MM Still Image Standard |
Oracle interMedia User'sGuide |
| SYS |
CHANGE_ON_INSTALL |
The account used to perform database administrationtasks |
Oracle DatabaseAdministrator's Guide |
| SYSMAN |
CHANGE_ON_INSTALL |
The account used toperform Oracle EnterpriseManager database administration tasks. Note that SYS and SYSTEM canalso perform these tasks. |
Oracle Enterprise Manager GridControl Installation and Basic Configuration |
| SYSTEM |
MANAGER |
Another account used to perform databaseadministration tasks. |