Oracle数据库默认用户密码及修改

     创建表空间和用户时，需要的时候竟然忘记了密码，试了好多次都没连接上，进而用户也被锁定，下面就教您处理Oracle默认用户的密码问题的方法，希望对和我一样情况的朋友们有所帮助。

     1.安装时选择的自动安装，忘了用户名和密码导致现在试了几个Oracle默认用户名密码後（表格中附带默认用户名及密码），都提示无效的用户名、密码，

Username
 Password
 Description
 See Also
 
CTXSYS
 CTXSYS
 The Oracle Text account
 Oracle Text Reference
 
DBSNMP
 DBSNMP
 The account used by the Management Agent component of Oracle Enterprise Manager to monitor and manage the database
 Oracle Enterprise Manager Grid Control Installation and Basic Configuration
 
LBACSYS
 LBACSYS
 The Oracle Label Security administrator account
 Oracle Label Security Administrator's Guide
 
MDDATA
 MDDATA
 The schema used by Oracle Spatial for storing Geocoder and router data
 Oracle Spatial User's Guide and Reference
 
MDSYS
 MDSYS
 The Oracle Spatial and Oracle interMedia Locator administrator account
 Oracle Spatial User's Guide and Reference
 
DMSYS
 DMSYS
 The Oracle Data Mining account.
 Oracle Data Mining Administrator's Guide

Oracle Data Mining Concepts
 
OLAPSYS
 MANAGER
 The account used to create OLAP metadata structures. It owns the OLAP Catalog (CWMLite).
 Oracle OLAP Application Developer's Guide
 
ORDPLUGINS
 ORDPLUGINS
 The Oracle interMedia user. Plug-ins supplied by Oracle and third party format plug-ins are installed in this schema.
 Oracle interMedia User's Guide
 
ORDSYS
 ORDSYS
 The Oracle interMedia administrator account
 Oracle interMedia 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.
 Oracle Database Performance Tuning Guide
 
SI_INFORMTN_SCHEMA
 SI_INFORMTN_SCHEMA
 The account that stores the information views for the SQL/MM Still Image Standard
 Oracle interMedia User's Guide
 
SYS
 CHANGE_ON_INSTALL
 The account used to perform database administration tasks
 Oracle Database Administrator's Guide
 
SYSMAN
 CHANGE_ON_INSTALL
 The 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 Configuration
 
SYSTEM
 MANAGER
 Another account used to perform database administration tasks.
 Oracle Database Administrator's Guide
 
这时候要找到一组用户名、密码提示被锁，才能进行下一步

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

    2.在CMD中启动SQLPLUS；用sqlplus/as sysdba登录，提示

连接到:

Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production

3. 执行ALTER USER 你被锁的用户名 ACCOUNT UNLOCK；

4. 重新用SQL/PLUS登录，用你刚刚解锁的用户名、密码；

    重新修改密码就可以了！

具体操作如下：
1.运行->sqlplus /nolog
2.输入conn / as sysdba 管理员账户登录
3.如果用户被锁定先解锁：
alter user system account unlock;
4.修改密码：
alter user system identified by wanglj;
接下来可以用sqlplus登陆了。

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