They both serve different niches, only that the older solution wasn’t as suitable for a specific need, thus the invention of the new solution to fill that gap. One isn’t necessarily a replacement for the other. In case it’s not clear, in this analogy, the train is the relational database and the car is the NoSQL database. Though rail transport was slower and not as flexible as the car, it was (and even today still is) very valuable for a different need – efficiently moving very large quantities of goods overland. This comparison is roughly akin to how the invention of the quicker, nimbler motor vehicle in the early 20th century did not necessarily usurp the train invented a few centuries earlier. And also not to have to rely on object-relational mapping (ORM). What the new NoSQL databases do is fulfill a need unmet by modeling with a relational data structure – the need for easy scalability, particularly with cloud computing deployments.
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