更改oracle数据库字符集

对已经建好的数据库更改字符集：（这里改成utf8）
Oracle用户下：
connect system/oracle10g as sysdba;

update props$ set value$=’UTF8′ where name=’NLS_CHARACTERSET’;

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 UTF8;

alter database national character set internal_use UTF8;

shutdown immediate;

startup;