1、查看数据库字符集

select * from v$nls_parameters where parameter = 'NLS_CHARACTERSET'

 

2、然后用sys用户进行修改

#sqlplus "/as sysdba"

>shutdown immediate;

>startup mount;

>ALTER SESSION SET SQL_TRACE=TRUE;

>ALTER SYSTEM ENABLE RESTRICTED SESSION;

>ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;

>ALTER SYSTEM SET AQ_TM_PROCESSES=0;

>ALTER DATABASE OPEN;

>alter database character set AL32UTF8;

ORA-12712: new character set must be a superset of old character set

RROR at line 1:

结果报错，提示新字符集必须是老字符集的超集。

3、于是强制转换

>ALTER DATABASE character set INTERNAL_USE AL32UTF8;

>shutdown immediate;

>STARTUP;

 

4、问题解决。