11g通过一个参数设置密码大小写敏感，下面来做个试验：

C:\Documents and Settings\guogang>sqlplus gg_test/gg_test@10.10.15.25_gg

sql*Plus: Release 10.2.0.1.0 - Production on 星期一 8月 4 17:54:19 2014

Copyright (c) 1982,2005,Oracle. All rights reserved.

连接到:

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

With the Partitioning,OLAP,Data Mining and Real Application Testing options

sql> select * from v$version;

BANNER

--------------------------------------------------------------------------------

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

PL/sql Release 11.2.0.1.0 - Production

CORE 11.2.0.1.0 Production

TNS for Linux: Version 11.2.0.1.0 - Production

NLSRTL Version 11.2.0.1.0 - Production

sql> show parameter sec_case_sensitive_logon

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

sec_case_sensitive_logon boolean TRUE

C:\Documents and Settings\guogang>sqlplus gg_test/gg_tesT@10.10.15.25_gg

sql*Plus: Release 10.2.0.1.0 - Production on 星期一 8月 4 17:54:06 2014

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

ERROR:

ORA-01017: invalid username/password; logon denied

请输入用户名:

C:\Documents and Settings\guogang>sqlplus gg_test/gg_test@10.10.15.25_gg

sql*Plus: Release 10.2.0.1.0 - Production on 星期一 8月 4 17:52:35 2014

Copyright (c) 1982,Data Mining and Real Application Testing options

sql> alter system set sec_case_sensitive_logon=false;

系统已更改。

sql> 从 Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

With the Partitioning,Data Mining and Real Application Testing options 断开

C:\Documents and Settings\guogang>sqlplus gg_test/gg_tesT@10.10.15.25_gg

sql*Plus: Release 10.2.0.1.0 - Production on 星期一 8月 4 17:53:48 2014

Copyright (c) 1982,Data Mining and Real Application Testing options

sql> show parameter sec_case_sensitive_logon

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

sec_case_sensitive_logon boolean FALSE

总结

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