oracle字符集AL32UTF8为ZHS16GBK

SQL> conn /as sysdba

SQL> select userenv('language') from dual;

USERENV('LANGUAGE')

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AMERICAN_AMERICA.AL32UTF8

SQL> shutdown immediate;

SQL> startup mount

SQL> ALTER SYSTEM ENABLE RESTRICTED SESSION;

SQL> ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;

SQL> ALTER SYSTEM SET AQ_TM_PROCESSES=0;

SQL> alter database open;

SQL> ALTER DATABASE CHARACTER SET ZHS16GBK;

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 ZHS16GBK;

--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> shutdown immediate;

SQL> startup

以后安装oracle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。

SQL> select userenv('language') from dual;

USERENV('LANGUAGE')

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AMERICAN_AMERICA.ZHS16GBK