I remember reading a story from Robert C. Martin, if I recall correctly, about writing an application and trying to decide which DB to use. In the end, they put

I remember reading a story from Robert C. Martin, if I recall correctly, about writing an application and trying to decide which DB to use. In the end, they put the DB access paths behind an abstraction and decided that they'd just use the file system to start with, and easily switch it out later. In the end, they shipped, and never did need to use a real DB.