Exam C100DEV Topic 1 Question 136 Discussion

Actual exam question for MongoDB's C100DEV exam
Question #: 136
Topic #: 1
What stages will cause a merge on the primary shard for a database?

Suggested Answer: A,B Vote an answer

$group stage can potentially result in a merge, but a random shard will be selected for the merging.
https://docs.mongodb.com/manual/reference/operator/aggregation/out/
https://docs.mongodb.com/manual/reference/operator/aggregation/lookup/
https://docs.mongodb.com/manual/reference/operator/aggregation/group/

by Harold at Jan 13, 2026, 12:32 PM

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