Check out the solution in the video MongoDB: Current Op. As we know with databases and transactions, we will sometimes want to get what is currently executing. We can see that we can obtain this information by using this query to get the current operations. Note the fields that return and the scenarios that we may see where we'll want more information.
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One thing I hear from clients from time to time: "according to the documents, this should be easy to run and yet there's all these hidden complexities about how this works." The truth is that this is true for everything (think of cars). When we sit down to buy a car, we don't know the possible issues that we can have with a car. Thus, we should understand that we'll run into issues from time to time with anything. Prevention is always cheaper than cure.