I heard the same argument from a certain breed of NoSQL fans (usually pushing MongoDB, in my experience...).  &quot;The datastore is schemaless!  It&#x27;s flexible!  You can iterate quickly!&quot;<p>I don&#x27;t think those claims hold up in practice.  In the real world, your data is never schemaless; it&#x27;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.