Note that your essay should focus on a single topic area in big data, and provide an in-depth and comprehensive discussion on important issues in the area of your focus. Depth is much more important than coverage for this assignment.
Hence concentrating on a small topic with your own insight is much better than briefly touching everything superficially.
For example, an essay talking about MongoDB or any other specific NoSQL database system and its usefulness in big data applications makes a good topic, whereas one that goes through all different types of general database systems does not, provided that both essays are about the same length.
Doing research is an important step for essay writing, as everything starts with proper reading and finding ideas from the reading materials
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