Greater normalization allows for greater schema evolution. If you start treating your relations as stating known properties about entities then you can create n

Greater normalization allows for greater schema evolution. If you start treating your relations as stating known properties about entities then you can create new collections of known properties, track them through time, merge and extend these schema all non-destructively. I don't think it requires a whole lot more thought that you ought to be putting into your Mongo "schemata" anyway. Now that kind of usage of relational databases will destroy MySQL since it doesn't do clever query planning.