When the TTL thread is active, you will see _______ operations in the output of db.currentOp().(a) delete(b) update(c) insert(d) none of the mentionedI have been asked this question in final exam.I would like to ask this question from Index Properties topic in division Index/Indexing Concepts of MongoDB

When the TTL thread is active, you will see _______ operations in the

1.	When the TTL thread is active, you will see _______ operations in the output of db.currentOp().(a) delete(b) update(c) insert(d) none of the mentionedI have been asked this question in final exam.I would like to ask this question from Index Properties topic in division Index/Indexing Concepts of MongoDB
Answer» Right answer is (a) delete For explanation I WOULD say: A BACKGROUND THREAD in mongod reads the values in the index and removes EXPIRED documents from the collection.

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