Question

Point out the correct statement.

(a) Data expiration is useful for some classes of information, including machine generated event data, logs, and session information

(b) A special TTL index property supports the implementation of TTL collections

(c) TTL collections make it possible to store data in MongoDB and have the mongod automatically remove data after a specified number of seconds or at a specific clock time

(d) All of the mentioned

The question was asked by my college professor while I was bunking the class.

Origin of the question is Data from Collections topic in division Monitoring MongoDB and Optimization Strategies for MongoDB of MongoDB

Answer 1

Right option is (d) All of the mentioned

The best I can explain: The TTL feature relies on a background thread in mongod that reads the date-typed values in the index and removes expired documents from the collection.