• 在执行如下任务时，可以把数据库启动到限制模式
  
  • 数据导入导出（import、export）
  • 数据的装载（SQL*Loader）
  • 阻止某些用户访问数据
  • 执行升级和迁移操作
    在限制模式下，只有create session和restricted session权限用户能访问数据库

数据库关闭条件下

[oracle@prod1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Sun Feb 22 18:50:04 2015

Copyright (c) 1982, 2009, Oracle.  All rights reserved.

Connected to an idle instance.

idle> startup restrict;

数据库已启动条件下

idle> alter system enable restricted session;

关闭限制模式

idle> alter system disable restricted session;

测试

[oracle@prod1 ~]$ sqlplus scott/tiger 

SQL*Plus: Release 11.2.0.1.0 Production on Sun Feb 22 18:53:42 2015

Copyright (c) 1982, 2009, Oracle.  All rights reserved.

ERROR:
ORA-01035: ORACLE only available to users with RESTRICTED SESSION privilege

#赋予scott用户restricted session权限
idle> grant restricted session to scott;

Grant succeeded.

#登录成功
[oracle@prod1 ~]$ sqlplus scott/tiger 

SQL*Plus: Release 11.2.0.1.0 Production on Sun Feb 22 18:55:15 2015

Copyright (c) 1982, 2009, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

scott@PROD>