Business Data Connectivity: SP2010 + SP2013

How to create business data connectivity service application

http://sharepointknowledgebase.blogspot.com/2014/03/how-to-create-business-data.html

Access Denied by Business Data Connectivity – Resolved

http://sharepointknowledgebase.blogspot.com/2014/04/access-denied-by-business-data.html

Business Data Connectivity metadata store is currently unavailable

http://sharepointknowledgebase.blogspot.com/2014/03/the-business-data-connectivity-metadata.html