O7_DICTIONARY_ACCESSIBILITY&REMOTE_OS_AUTHENT

O7_DICTIONARY_ACCESSIBILITY 控制具有ANY OBJECT权限的用户 对SYS模式下的OBJECT是否具有访问，修改权限。这个参数默认为FALSE，如果这个参数为TRUE，那么SYS也不需要 写 as sysdba 就可以登录 数据库

SQL> alter system set O7_DICTIONARY_ACCESSIBILITY=true scope=spfile;

System altered.

  

重启数据库

SQL> grant select any table to robinson;

Grant succeeded.

SQL> select * from user_sys_privs;

USERNAME                       PRIVILEGE                                ADM
------------------------------ ---------------------------------------- ---
ROBINSON                       CREATE SESSION                           NO
ROBINSON                       SELECT ANY TABLE                         NO 可以看到robinson用户具有select any table 权限
ROBINSON                       UNLIMITED TABLESPACE                NO

 
SQL> select count(*) from sys.obj$; 

 COUNT(*)
----------
     11617

SQL> alter system set O7_DICTIONARY_ACCESSIBILITY=false scope=sPfile;

 System altered.

重启数据库

SQL> select count(*) from sys.obj$;
select count(*) from sys.obj$
                                    *
ERROR at line 1:
ORA-00942: table or view does not exist

REMOTE_OS_AUTHENT 该参数控制某个用户从远程登录到数据库服务器，需不需要给出用户名和密码再登录到数据库

通过putty 远程登录到数据库服务器

[oracle@oracle ~]$ whoami
oracle  用户名为oracle

将remote_os_authent 改为TRUE ，我这里已经改了

SQL> show parameter remote_os

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
remote_os_authent                    boolean     TRUE

创建与操作系统同名的数据库用户名

SQL> create user oracle identified externally;

User created.

确保os_authent_prefix被清空，这里我已经清空了，默认为OPS$

SQL> show parameter os_authent_prefix

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
os_authent_prefix                    string

授予oracle 用户基本权限，使之能登陆数据库
SQL> grant connect,resource to oracle;

Grant succeeded.

测试一下不用输入 用户名和密码 能不能登录数据库

[oracle@oracle ~]$ sqlplus /

SQL*Plus: Release 10.2.0.2.0 - Production on Tue Sep 29 12:59:27 2009

Copyright (c) 1982, 2005, Oracle.  All Rights Reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options

SQL> show user
USER is "ORACLE"

OK,成功了