oracle修改字符集utf8

先用sqlplus 系統用戶登錄：

sqlplus / as sysdba;

然后執行下面的命令即可：

shutdown immediate;     //關閉數據庫服務器
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 internal_use utf8;
alter session set sql_trace=false;
shutdown immediate;
startup;