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How is Schema on Read different from Schema on Write? Which does Big Data use and why? What ability does MapReduce provide? Why is that

How is Schema on Read different from Schema on Write? Which does Big Data use and why?

What ability does MapReduce provide? Why is that useful for storing and analyzing Big Data?

Why is prescriptive analytics the most difficult of the 3 types of analytics to perform? Give one example of it.

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