Grokking MongoDB
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MongoDB Map-Reduce
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Map-Reduce is a data processing paradigm used for condensing large volumes of data into aggregated results. In MongoDB, Map-Reduce allows you to perform aggregation operations by defining a map function to process each document and a reduce function to combine the output of the map operation.

However, it is important to note that Map-Reduce is generally not recommended for new projects due to its complexity and inefficiency compared to the aggregation pipeline, which is faster and more efficient.

When to Use Map-Reduce

Map-Reduce can be used in the following scenarios:

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