source :
https://docs.oracle.com/database/121/DBSEG/audit_admin.htm#DBSEG474
http://orababy.blogspot.fr/2013/09/move-aud-and-fga-tables-from-system.html
http://krishnaappsdba.blogspot.fr/2014/03/how-to-move-aud-table-from-system.html
http://www.dbarj.com.br/en/2013/05/changing-audit-tablespace-create-purge-job-11g/