Change Characterset to UTF8 in Oracle Database

Change Characterset to UTF8 in oracle
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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 UTF8;


SQL> shutdown immediate;
SQL> startup;