Oracle database 12C Documentation reference

+ http://docs.oracle.com/database/121/index.htm

+ Metalink: Information Center: Oracle Database 12c Release 1 (Doc ID 1595421.2)

+ https://apex.oracle.com/pls/apex/f?p=44785:141:3264054543271::::P141_PAGE_ID%2CP141_SECTION_ID:6%2C18

+ http://www.oraclealchemist.com/news/install-oracle-12c-12-1/