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The aggregation pipeline can use ___________ to improve its performance during some of its stages.

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The aggregation pipeline can use ___________ to improve its performance during some of its stages.

(a) indexes

(b) OptmData

(c) functions

(d) all of the mentioned

This question was addressed to me by my college director while I was bunking the class.

My question is from Aggregation topic in division Aggregation Concepts and Aggregation Mechanics of MongoDB

1 Answer

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Best answer
Right choice is (a) indexes

To elaborate: Both the aggregation pipeline and map-reduce can operate on a sharded collection.

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