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MongoDB's flexible schema has a lot of advantages and is clearly popular with modern application developers. However, flexible schema does not mean no schema, and those wishing to develop performant ...

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

The flexibility of the schema: A document’s schema is dynamic and self-describing, so developers don’t need to first pre-define it in the database. Fields can vary from document to document.

I'm thinking there has to be some rational method of, say, storing your schema version in the database, having scripts to migrate between versions, etc.