I heard the same argument from a certain breed of NoSQL fans (usually pushing MongoDB, in my experience...). "The datastore is schemaless! It's flexible! You

I heard the same argument from a certain breed of NoSQL fans (usually pushing MongoDB, in my experience...). "The datastore is schemaless! It's flexible! You can iterate quickly!" I don't think those claims hold up in practice. In the real world, your data is never schemaless; it's just a question of how explicit you want to make the schema. With the added benefit that we have excellent tooling to help with, eg, migrating explicit schemas.