Why do you think NoSQL databases and flat files are useful now when in the past they weren't as feasible?

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A: NOTE  :-  Below i explain the answer in my own words by which you understand it well.

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A: The solutions is an given below :

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Fundamentals of Big Data Analytics

Big data analytics is the process of using advanced analyzing techniques against huge variant data sets to uncover hidden pattern or knowledge. It helps in organization's decision making process. Big data can be organized in any of the following formats.