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____________ returns information on the query plan for aggregate function.

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____________ returns information on the query plan for aggregate function.

(a) Reporter

(b) db.collection.explain()

(c) db.collection.explainplan()

(d) None of the mentioned

This question was addressed to me during an interview.

Question is taken from Optimization Strategies topic in section Monitoring MongoDB and Optimization Strategies for MongoDB of MongoDB

1 Answer

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Best answer
Correct choice is (b) db.collection.explain()

Best explanation: MongoDB runs the query optimizer to choose the winning plan for the operation under evaluation.

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