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, 2005, 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, 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> 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, OLAP, 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, 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> show parameter sec_case_sensitive_logon NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ sec_case_sensitive_logon boolean FALSE