1. 安装时选择的自动安装，由于时间久远忘记用户名、密码了，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，终于在试了下dbsnmp/dbsnmp，提示被锁；
2. 在CMD中启动SQLPLUS；用sqlplus/as sysdba登录，提示
连接到:
Oracle Database
3. 执行ALTER USER DBSNMP ACCOUNT UNLOCK；
4. 从新用SQL/PLUS登录，设置用户名、密码；
注：由于刚才解锁的用户名是DBSNMP，所以这里设置的用户名也是DBSNMP
Oracle
| 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 |
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