官方文档解释

REMOTE_LOGIN_PASSWORDFILE
Property     Description
Parameter type     String
Syntax     REMOTE_LOGIN_PASSWORDFILE&＃61;

{NONE | SHARED}
Default value     SHARED
Modifiable     No
Basic     Yes
Real Application Clusters     Multiple instances must have the same value.

REMOTE_LOGIN_PASSWORDFILE specifies whether Oracle checks for a password file.

Values:

   NONE

   Oracle ignores any password file. Therefore, privileged users must be authenticated by the operating system.

   SHARED

   One or more databases can use the password file. The password file can contain SYS as well as non-SYS users.

Note:
The value EXCLUSIVE is supported for backward compatibility. It now has the same behavior as the value SHARED

[oracle&＃64;dw ~]$ sqlplus "/as sysdba"

SQL*Plus: Release 10.2.0.4.0 - Production on Fri Jul 12 10:01:30 2013

Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> show parameter pass  

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
remote_login_passwordfile            string      EXCLUSIVE


客户端登陆
C:\Users\wen>sqlplus sys/oracle&＃64;192.168.67.5:1522/oocc as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Tue Aug 13 14:28:00 2013

Copyright (c) 1982, 2010, Oracle.  All rights reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

登陆成功

修改参数remote_login_passwordfile&＃61;none&＃xff1b;
SQL> alter system set remote_login_passwordfile&＃61;none scope&＃61;spfile;

System altered.

SQL> startup force;
ORACLE instance started.

Total System Global Area  159383552 bytes
Fixed Size                  2082432 bytes
Variable Size             117442944 bytes
Database Buffers           37748736 bytes
Redo Buffers                2109440 bytes
Database mounted.
Database opened.
SQL> show parameter pass

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
remote_login_passwordfile            string      NONE
SQL>


再次在客户端登陆&＃xff1a;
C:\Users\wen>sqlplus sys/oracle&＃64;192.168.67.5:1522/oocc as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Tue Aug 13 14:29:44 2013

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

ERROR:
ORA-01017: invalid username/password; logon denied


Enter user-name:
ERROR:
ORA-12560: TNS:protocol adapter error


Enter user-name:
ERROR:
ORA-12560: TNS:protocol adapter error

修改参数等于none后&＃xff0c;只能通过操作系统认证