我们通过通过在ora_dba（windows）和dba(unix/linux)以及在sqlnent.ora中修改SQLNET.AUTHENTICATION_SERVICES的值来控制os认证的启用以及屏蔽。
[@more@]有关sqlnet.ora中SQLNET.AUTHENTICATION_SERVICES的含义oracle给出了如下解释：
SQLNET.AUTHENTICATION_SERVICES
Purpose
Use the parameter SQLNET.AUTHENTICATION_SERVICES to enable one or more authentication services. If authentication has been installed, it is recommended that this parameter be set to either none or to one of the authentication methods.
Default
None
Values
Authentication Methods Available with Oracle Net Services:
* none for no authentication methods. A valid username and password can be used to access the database.
* all for all authentication methods
* nts for Windows NT native authentication
Windows NT native authentication
An authentication method that enables a client single login access to a Windows NT server and a database running on the server.
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