使用Oracle外部身份认证，提高系统安全性

Oracle允许通过外部身份认证创建用户，这样登陆时可以不需要输入口令，从而提高安全性。
以下是Linux中测试的例子.

[oracle@jumper oracle]$ sqlplus "/ as sysdba"

SQL*Plus: Release 9.2.0.4.0 - Production on Mon Mar 21 09:44:03 2005

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

show 
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production

SQL> show parameters os_authent_prefix 

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
os_authent_prefix                    string      ops$
SQL> create user ops$gqgai identified externally;

User created.

SQL> grant connect to ops$gqgai;

Grant succeeded.

SQL> exit
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
[oracle@jumper oracle]$ su - gqgai
Password: 
[gqgai@jumper gqgai]$ sqlplus /

SQL*Plus: Release 9.2.0.4.0 - Production on Mon Mar 21 10:08:00 2005

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.


Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production

SQL> show user
USER is "OPS$GQGAI"
SQL>

简单测试，仅供参考。