Save Subset of MongoDB Collection to Another Collection

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I would advise using the aggregation framework:

db.full_set.aggregate([ { $match: { date: "20120105" } }, { $out: "subset" } ])

It works about 100 times faster than forEach at least in my case. This is because the entire aggregation pipeline runs in the mongod process, whereas a solution based on find() and insert() has to send all of the documents from the server to the client and then back. This has a performance penalty, even if the server and client are on the same machine.

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