更改数据库字符集编码

sqlplus /nolog

connect sys as sysdba

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-- these parameters have to be changed
-- in order to change characterset
--------------------------------------------------------
Alter system set job_queue_processes=0 scope=spfile;
Alter system set aq_tm_processes=0 scope=spfile;

shutdown immediate
startup nomount
alter database mount exclusive;
alter database open;
alter system enable restricted session;
purge dba_recyclebin;
alter database character set internal_use AL32UTF8;
alter database national character set internal_use UTF8;

shutdown immediate
startup