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When the TTL thread is active, you will see _______ operations in the output of db.currentOp().

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When the TTL thread is active, you will see _______ operations in the output of db.currentOp().

(a) read

(b) update

(c) delete

(d) all of the mentioned

This question was addressed to me in an online interview.

I need to ask this question from MongoDB Maintenance topic in chapter GridFS, BSON Datatype and Administration Concepts of MongoDB

1 Answer

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Best answer
Correct choice is (c) delete

The best I can explain: When you build a TTL index in the background, the TTL thread can begin deleting documents while the index is building.

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