linux oracle修改编码utf8

$ sqlplus /nolog 

SQL> connect sys/oracle as sysdba

SQL> startup

 如何设置ORACLE数据库的编码（ZHS16GBK）修改成UTF8 

SQL> shutdown immediate;

SQL> startup mount;

SQL> alter system enable restricted session;

SQL> alter system set job_queue_processes=0;

SQL> alter database open;

SQL> alter database character set internal_use UTF8;

SQL> shutdown immediate;

SQL> startup