A pointer to various database style discussion, like [application database], [integration database], [silly database], [smart database] ...

http://www.pervasivecode.com/blog/2007/08/02/rails-and-the-notion-of-stupid-databases-being-a-good-idea/

BDD for database design 

Requirements are behavior,
Provides "ubiquitous language" for analysis,
Acceptance criteria should be executable.
Design constraints should be made into executable tests.

- http://www.methodsandtools.com/archive/archive.php?id=78

http://dublintech.blogspot.hk/2016/06/agile-databases.html