It is, however, still a “dual schema” problem, in that now you have two competing “sources of truth” that have to be reconciled to one another, the database schema, and the object model.

Fauna, the distributed document-relational database delivered as a cloud API, today announced a new declarative schema and a suite of DevOps tooling a ...

Although relational database schemas can be molded, eventually the schema is set and inflexible to change. On the other hand, NoSQL document databases are schema-agnostic.