用sys用户sqlplus连接到数据:

SQL*Plus: Release 11.2.0.3.0 Production on Thu Jun 22 11:07:58 2017

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Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options

SQL> show 　parameter sec_case_sensitive_logon;

NAME                                       TYPE                VALUE
------------------------------------    -----------     ------------------------------
sec_case_sensitive_logon       boolean             TRUE

SQL> ALTER SYSTEM SET SEC_CASE_SENSITIVE_LOGON = FALSE;

 
系统已更改。
 
SQL> show 　parameter  sec_case_sensitive_logon
 
NAME                                             TYPE        VALUE
------------------------------------      -----------     ------------------------------
sec_case_sensitive_logon             boolean     FALSE
SQL>

查看oracle 11g数据库用户的密码是否区分大小写