Oracle数据库修改为UTF-8格式

用sys身份登录
依次输入下面的语句就OK了

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 internal_use utf8;
shutdown immediate;
startup;

编码格式就修改完了，大家可以用下面的语句查一下就知道了

	select userenv('language') from dual;