PL/SQL database character set(AL32UTF8) and Client character set(ZHS16GBK) are different

ORA-12712: new character set must be a superset of old character set
提示我们的字符集：新字符集必须为旧字符集的超集，这时我们可以跳过超集的检查做更改：
SQL> ALTER DATABASE character set INTERNAL_USE AL32UTF8;
--我们看到这个过程和之前ALTER DATABASE CHARACTER SET操作的内部过程是完全相同的，也就是说INTERNAL_USE提供的帮助就是使Oracle数据库绕过了子集与超集的校验.
SQL> select * from v$nls_parameters; 

SQL> shutdown immediate;

SQL> startup

SQL> select * from v$nls_parameters;
以后安装oracle11g的时候记得选择自定义安装，把这个字符集的事情事先弄好

PL/SQL database character set(AL32UTF8) and Client character set(ZHS16GBK) are different

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