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The currentOp command is an administrative command that provides information about the current operations executing on the MongoDB server. This article discusses its applications, use case scenarios and finally some hands-on lab exercises. This is one of the many articles in multi-part series, Mastering MongoDB — One tip a day, solely created for you to master MongoDB by learning ‘one tip a a day’. This article is a series of articles to help you answer the question ‘Why is your MongoDB database server running slow?’