Robo 3T is a MongoDB management tool. Robo 3T (formerly Robomongo) doesn't emulate the MongoDB shell, it embeds the same engine and environment, that is a part of mongo shell. Currently it embeds the latest MongoDB 3.2 shell. All operations that you perform on MongoDB are done asynchronously and do not block main application thread. This makes Robo 3T (formerly Robomongo) feel light and snappy.
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