Oracleデータ符号化の変更

connect system/oracle9i as sysdba 
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 ZHS16GBK ; 
shutdown immediate 
startup