怎么解决oracle 19c sec_case_sensitive_logon参数问题

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11g前，密码不区分大小写，11g开始引入了sec_case_sensitive_logon参数控制密码敏感，默认true，大小写敏感。

安装完19C后，将sec_case_sensitive_logon调成false，设置密码大小写不敏感后，发现即使使用正确的密码也无法登录了。

原来19C中早已废弃了sec_case_sensitive_logon参数，重启数据库也可以看到提示：

MOS上相关的文章有很多，例如：

DBUA Removes SEC_CASE_SENSITIVE_LOGON Init Parameter After Upgrading to 12c (Doc ID 2107717.1)SEC_CASE_SENSITIVE_LOGON init parameter has been deprecated in 12c, hence ideally you should comment out this parameter before upgrade to 12c. But if you still set SEC_CASE_SENSITIVE_LOGON system parameter, the Database Upgrade Assistant (DBUA) removes the SEC_CASE_SENSITIVE_LOGON system parameter during the upgrade process if it exists in the parameter file (reference Bug 16238456 ).18c: All user connections fail with ORA-01017 except SYS when SEC_CASE_SENSITIVE_LOGON=FALSE (Doc ID 2502204.1)What Is the SEC_CASE_SENSITIVE_LOGON Parameter and How Is It Used? (Doc ID 2378179.1)The SEC_CASE_SENSITIVE_LOGON parameter enables or disables password case sensitivity in the database. It is defaulted to a TRUE value.True - Database logon passwords are case sensitiveFalse - Database logon passwords are not case sensitiveFor additional information please refer to the following Database Security Guide: https://docs.oracle.com/database/121/DBSEG/authentication.htm#DBSEG3225

测试过程如下：

查看数据库版本

SQL> select banner from v$version;BANNER--------------------------------------------------------------------------------Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production

启动所有PDB

SQL> alter pluggable database all open;SQL> show pdbs    CON_ID CON_NAME  OPEN MODE  RESTRICTED---------- ------------------------------ ---------- ---------- 2 PDB$SEED  READ ONLY  NO 3 CJCPDB  READ WRITE NO

查看当前参数值

SQL> show parameter sec_case_sensitive_logonNAME     TYPE VALUE------------------------------------ ----------- ------------------------------sec_case_sensitive_logon     boolean TRUE

创建新用户

SQL> create user c##chen identified by a;User created.SQL> grant connect to c##chen;Grant succeeded.

密码区分大小写

SQL> conn c##chen/aConnected.SQL> conn c##chen/AERROR:ORA-01017: invalid username/password; logon deniedWarning: You are no longer connected to ORACLE.

更改参数

SQL> show parameter sec_case_sensitive_logonNAME     TYPE VALUE------------------------------------ ----------- ------------------------------sec_case_sensitive_logon     boolean TRUE

SQL> conn / as sysdbaConnected.SQL> alter system set sec_case_sensitive_logon=false;System altered.

新用户无法登录(即使使用正确的密码)

SQL> conn c##chen/aERROR:ORA-01017: invalid username/password; logon deniedWarning: You are no longer connected to ORACLE.SQL> conn c##chen/AERROR:ORA-01017: invalid username/password; logon denied

改回参数

SQL> conn / as sysdbaConnected.SQL> alter system set sec_case_sensitive_logon=true;System altered.SQL> conn c##chen/AERROR:ORA-01017: invalid username/password; logon deniedWarning: You are no longer connected to ORACLE.

可以正常登录

SQL> conn c##chen/aConnected.SQL> show userUSER is "C##CHEN"

也可以通过设置sqlnet.ora，实现大小写不敏感

该参数用来限制可以连接到数据库服务器上的最小客户端版本，比如设置值为10，即10g，11g等以上客户端版本可以连接到数据库服务器上。

[oracle@cjcos01 admin]$ pwd/u01/app/oracle/product/19.0.0/dbhome_1/network/admin[oracle@cjcos01 admin]$ cat sqlnet.ora SQLNET.ALLOWED_LOGON_VERSION_SERVER=8 SQLNET.ALLOWED_LOGON_VERSION_CLIENT=8

修改参数

SQL> alter system set sec_case_sensitive_logon=false;System altered.

创建用户

SQL> create user c##ccc identified by a;User created.SQL> grant connect to c##ccc;Grant succeeded.

密码大小写不敏感

SQL> conn c##ccc/aConnected.SQL> conn c##ccc/AConnected.

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