* oracle Character set을 변경하려면 sysdba로 접속해야 한다.
command>SQLPLUS "/AS SYSDBA"
SQL>SHUTDOWN IMMEDIATE;
SQL>STARTUP MOUNT;
SQL>ALTER SYSTEM ENABLE RESTRICTED SESSION;
SQL>ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
SQL>ALTER SYSTEM SET AQ_TM_PROCESSES=0;
SQL>ALTER DATABASE OPEN;
SQL>ALTER DATABASE CHARACTER SET INTERNAL_USE KO16KSC5601;
SQL>SHUTDOWN IMMEDIATE;
SQL>STARTUP;