Common User vs. Local User – 12c Edition
http://dbasolved.com/2013/06/29/common-user-vs-local-user-12c-edition/
ORA-65096: create 12c user without c## prefix
http://www.dba-oracle.com/t_ora_65096_create_user_12c_without_c_prefix.htm
Oracle Database 12c: New Features - Pluggable Databases
http://www.orafaq.com/node/2756