先查詢一下select userenv('language') from dual;查看oracle字符集，

$ sqlplus /nolog?

SQL> connect sys/oracle as sysdba

SQL> startup

?如何設置ORACLE數據庫的編碼（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;

oracle數據表中的中文變問號