Change Database Character-set and National Character-set

connect sys as sysdba
 -- 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

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