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- mapReduce and the corresponding mongo shell method db.collection.mapReduce(). mapReduce operations map, or associate, values to keys, and for keys with multiple values, reduce the values for each key to a single object. For more information, see Map-Reduce.
Running .js files via a mongo shell Instance on the Server¶
For more information, see Write Scripts for the mongo Shell.
Refer to the individual method or operator documentation for any concurrency information. See also the concurrency table.