Oracle Sqlplus Logon Authentication problem

After installing Oracle on the Linux,unix operating system, use the Sqlplus '/as sysdba ' command to log in to the Oracle database as SYSDBA, which has some security implications, The operating system administrator can also log Oracle users to the Oracle database, do some sysdba the same thing, and then think, can not cancel this method of operating system authentication, and use Oracle username and password authentication, after searching documents, found that in $oracle_ Add the following in the Home/network/admin/sqlnet.ora file, sqlnet. Authentication_services= (NONE), you can cancel the operation certification, the following is illustrated with a practical example:

Login status before adding

[Oracle@node78 admin]$ more Sqlnet.ora
[Oracle@node78 admin]$

[oracle@node78 ~]$ sqlplus '/as sysdba '

Sql*plus:release 10.2.0.1.0-production on Mon Oct 17 11:36:20 2011

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

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0-production
With the partitioning, OLAP and Data Mining options

Sql>

After the addition

[Oracle@node78 admin]$ more Sqlnet.ora
Sqlnet. Authentication_services= (NONE)
[oracle@node78 admin]$ sqlplus '/as sysdba '

Sql*plus:release 10.2.0.1.0-production on Mon Oct 17 11:37:30 2011

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

ERROR:
Ora-01031:insufficient Privileges

Enter User-name:

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