[oracle@gpdb ~]$ sqlplus /nolog
SQL> conn /as sysdba;
SQL>select userenv('language') from dual;
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 US7ASCII;
SQL>SHUTDOWN IMMEDIATE;
SQL>STARTUP;
SQL>select userenv('language') from dual;
常见的Oracle字符集有ZHS16GBK、AL32UTF8、US7ASCII等