Question

oracle忘记用户名密码怎样办？？？

Answer 1

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: 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 UsernamePasswordDescriptionSee AlsoCTXSYSCTXSYS The Oracle Text accountOracle Text ReferenceDBSNMPDBSNMPThe account used by the Management Agent component of Oracle Enterprise Manager to monitor and manage the databaseOracle Enterprise Manager Grid Control Installation and Basic ConfigurationLBACSYSLBACSYS The Oracle Label Security administrator accountOracle Label Security Administrator's GuideMDDATAMDDATAThe schema used by Oracle Spatial for storing Geocoder and router dataOracle Spatial User's Guide and ReferenceMDSYSMDSYS The Oracle Spatial and Oracle interMedia Locator administrator accountOracle Spatial User's Guide and ReferenceDMSYSDMSYS The Oracle Data Mining account.Oracle Data Mining Administrator's GuideOracle Data Mining ConceptsOLAPSYSMANAGERThe account used to create OLAP metadata structures. It owns the OLAP Catalog (CWMLite).Oracle OLAP Application Developer's GuideORDPLUGINSORDPLUGINS The Oracle interMedia user. Plug-ins supplied by Oracle and third party format plug-ins are installed in this schema.Oracle interMedia User's GuideORDSYSORDSYS The Oracle interMedia administrator accountOracle interMedia User's GuideOUTLNOUTLNThe 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.Oracle Database Performance Tuning GuideSI_INFORMTN_SCHEMASI_INFORMTN_SCHEMAThe account that stores the information views for the SQL/MM Still Image StandardOracle interMedia User's GuideSYSCHANGE_ON_INSTALLThe account used to perform database administration tasksOracle Database Administrator's GuideSYSMANCHANGE_ON_INSTALLThe account used to perform Oracle Enterprise Manager database administration tasks. Note that SYS and SYSTEM can also perform these tasks.Oracle Enterprise Manager Grid Control Installation and Basic ConfigurationSYSTEMMANAGERAnother account used to perform database administration tasks.