Oracle 隐含参数：_case_sensitive_logon 的事例
隐含参数：_case_sensitive_logon
开关： True/False 默认是True
状态： Spfile
如下：
SYS@PROD1> conn lyn/Oracle
ERROR:
ORA-01017: invalid username/password; logon denied
Warning: You are no longer connected to ORACLE.
@> conn / as sysdba
Connected.
SYS@PROD1> alter system set _case_sensitive_logon=false;
alter system set _case_sensitive_logon=false
*
ERROR at line 1:
ORA-00911: invalid character
SYS@PROD1> alter system set "_case_sensitive_logon"=false;
alter system set "_case_sensitive_logon"=false
*
ERROR at line 1:
ORA-02095: specified initialization parameter cannot be modified
SYS@PROD1> alter system set "_case_sensitive_logon"=false scope=spfile;
System altered.
SYS@PROD1> startup force;
ORACLE instance started.
Total System Global Area 418484224 bytes
Fixed Size 1345352 bytes
Variable Size 281020600 bytes
Database Buffers 130023424 bytes
Redo Buffers 6094848 bytes
Database mounted.
Database opened.
SYS@PROD1> conn lyn/OraclE
Connected.
LYN@PROD1>
注意点
1，默认值是True
2，修改时要加双引号
3，修改状态范围是Spfile，需要重启生效