Oracle 10G 默认用户名密码及解锁。

　很久没有使用sqlplus创建表空间和用户了，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，在网上找了一些资料，问题解决了，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默认的用户名密码後（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 Text account	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 qiushun;

　　接下来可以用sqlplus登陆了。