What does that “DB” word do there? ;-).
I’ve had a couple of times in the past where we went full-out TDD and YAGNI, and ended up with no database. Just some code dumping data out to disk in whatever the native format was (in this world, :erlang.term_to_binary is your friend). As someone remarked, a database is especially useful if you need to coordinate multiple instances of your app, so in modern systems it often serves more as a distribution tool than a persistence tool, if you want that categorization. To that end, it is often the simplest (most readily available, best documented) tool for the job.
