Development of applications in a clustered environment

What advantage does the aggregate data model offer for development of applications in a clustered environment?
How does aggregate orientation (i.e., the aggregate data model compare to the relational model?

How do NoSQL databases differ from the relational model with respect to transaction processing?

List four common categories of NoSQL database. Whic of them are aggregate-oiented? Which is not aggregate-oriented?

How do key-value and document data models differ? In what ways are they similar?

How do column-family stores compare to document data models?

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