ORACLE 忘记数据库密码

对于oracle10g来说：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 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

[align=left]Username[/align]	[align=left]Password[/align]	[align=left]Description[/align]	[align=left]See Also[/align]
[align=left]CTXSYS[/align]	[align=left]CTXSYS[/align]	[align=left]The Oracle Text account[/align]	[align=left]Oracle Text Reference[/align]
[align=left]DBSNMP[/align]	[align=left]DBSNMP[/align]	[align=left]The account used by the Management Agent component of Oracle Enterprise Manager to monitor and manage the database[/align]	[align=left]Oracle Enterprise Manager Grid Control Installation and Basic Configuration[/align]
[align=left]LBACSYS[/align]	[align=left]LBACSYS[/align]	[align=left]The Oracle Label Security administrator account[/align]	[align=left]Oracle Label Security Administrator's Guide[/align]
[align=left]MDDATA[/align]	[align=left]MDDATA[/align]	[align=left]The schema used by Oracle Spatial for storing Geocoder and router data[/align]	[align=left]Oracle Spatial User's Guide and Reference[/align]
[align=left]MDSYS[/align]	[align=left]MDSYS[/align]	[align=left]The Oracle Spatial and Oracle interMedia Locator administrator account[/align]	[align=left]Oracle Spatial User's Guide and Reference[/align]
[align=left]DMSYS[/align]	[align=left]DMSYS[/align]	[align=left]The Oracle Data Mining account.[/align]	[align=left]Oracle Data Mining Administrator's Guide[/align][align=left]Oracle Data Mining Concepts[/align]
[align=left]OLAPSYS[/align]	[align=left]MANAGER[/align]	[align=left]The account used to create OLAP metadata structures. It owns the OLAP Catalog (CWMLite).[/align]	[align=left]Oracle OLAP Application Developer's Guide[/align]
[align=left]ORDPLUGINS[/align]	[align=left]ORDPLUGINS[/align]	[align=left]The Oracle interMedia user. Plug-ins supplied by Oracle and third party format plug-ins are installed in this schema.[/align]	[align=left]Oracle interMedia User's Guide[/align]
[align=left]ORDSYS[/align]	[align=left]ORDSYS[/align]	[align=left]The Oracle interMedia administrator account[/align]	[align=left]Oracle interMedia User's Guide[/align]
[align=left]OUTLN[/align]	[align=left]OUTLN[/align]	[align=left]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.[/align]	[align=left]Oracle Database Performance Tuning Guide[/align]
[align=left]SI_INFORMTN_SCHEMA[/align]	[align=left]SI_INFORMTN_SCHEMA[/align]	[align=left]The account that stores the information views for the SQL/MM Still Image Standard[/align]	[align=left]Oracle interMedia User's Guide[/align]
[align=left]SYS[/align]	[align=left]CHANGE_ON_INSTALL[/align]	[align=left]The account used to perform database administration tasks[/align]	[align=left]Oracle Database Administrator's Guide[/align]
[align=left]SYSMAN[/align]	[align=left]CHANGE_ON_INSTALL[/align]	[align=left]The account used to perform Oracle Enterprise Manager database administration tasks. Note that SYS and SYSTEM can also perform these tasks.[/align]	[align=left]Oracle Enterprise Manager Grid Control Installation and Basic Configuration[/align]
[align=left]SYSTEM[/align]	[align=left]MANAGER[/align]	[align=left]Another account used to perform database administration tasks.[/align]