oracle更改数据库字符集

shutdown immediate;
startup mount;
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 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： 
#alter database character set internal_use zhs16gbk;

#alter database national character set internal zhs16gbk;
shutdown immediate;
startup;