(Answered) Centralized versus decentralized database management

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"Centralized versus Decentralized Database Management Systems" Please respond to the following:

Big Data brought its own challenges to the field of databases. What are these challenges, and how does the emerging NoSQL model address these challenges?

The different NoSQL technologies were created to meet different needs. Choose one of the NoSQL data models and describe it. Explain what kind of applications would benefit from your chosen NoSQL data model.

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