Oracle 11g 新特性数据库用户密码区分大小写参数sec_case_sensitive_logon对sys无效

Oracle 11g 新特性数据库用户密码区分大小写参数：

Oracle官方文档解释如下：



1、操作系统版本及数据库版本

SQL> !cat /etc/issue

Red Hat Enterprise Linux Server release 6.5 (Santiago)

Kernel \r on an \m

SQL> select * from v$version;

BANNER

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

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

PL/SQL Release 11.2.0.4.0 - Production

CORE 11.2.0.4.0 Production

TNS for Linux: Version 11.2.0.4.0 - Production

NLSRTL Version 11.2.0.4.0 - Production

2、当sec_case_sensitive_logon = TRUE时，启用区分密码大小写特性

SQL> show parameter sec_case_sensitive_logon

NAME TYPE VALUE

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

sec_case_sensitive_logon boolean TRUE

SQL> alter user sys identified by Oracle;

User altered.

SQL> alter user system identified by Oracle;

User altered.

SQL> create user tt identified by Tt;

User created.

SQL> grant connect,resource to tt;

Grant succeeded.

SQL> conn tt/tt

ERROR:

ORA-01017: invalid username/password; logon denied

Warning: You are no longer connected to ORACLE.

SQL> conn tt/Tt

Connected.

SQL> conn sys/Oracle@orcl as sysdba

Connected.

SQL> conn sys/oracle@orcl as sysdba

ERROR:

ORA-01017: invalid username/password; logon denied

Warning: You are no longer connected to ORACLE.

SQL> conn system/oracle

ERROR:

ORA-01017: invalid username/password; logon denied

SQL> conn system/Oracle

Connected.

可知，当sec_case_sensitive_logon = TRUE时，所有用户密码均区分大小写。

3、当sec_case_sensitive_logon = false时，不启用区分密码大小写特性

SQL> conn / as sysdba

Connected.

SQL> alter system set sec_case_sensitive_logon=false;

System altered.

SQL> show parameter sec_case_sensitive_logon

NAME TYPE VALUE

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

sec_case_sensitive_logon boolean FALSE

SQL> conn tt/tt

Connected.

SQL> conn tt/Tt

Connected.

SQL> conn system/Oracle
Connected.
SQL> conn system/oracle
Connected.
SQL>

SQL> conn sys/Oracle@orcl as sysdba
Connected.
SQL> conn sys/oracle@orcl as sysdba
ERROR:
ORA-01017: invalid username/password; logon denied
Warning: You are no longer connected to ORACLE.

由此可知，当sec_case_sensitive_logon = false时，普通用户密码是不区分大小写的，但是sys的密码还是区分大小写。