Free MongoDB C100DEV Exam Questions

Become MongoDB Certified with updated C100DEV exam questions and correct answers

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Total 411 Questions | Updated On: Mar 08, 2026
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Question 1

Which of the following is the best practice for managing MongoDB data growth in a production environment (scale-out)?


Answer: C
Question 2

Suppose you insert the following documents into a companies collection:
db.companies.insertMany([
    {"name": "Facebook"}, 
    {"name": "X"}
])
Select all true statements about this command. (Select three)


Answer: C,D,E
Question 3

You are developing a MongoDB application where write performance is a critical requirement. Given a scenario where your application primarily performs insert operations and rarely performs updates or deletes, which of the following MongoDB features would best optimize this heavy-write workload?


Answer: D
Question 4

We have an accounts collection with the following document structure:
{
  _id: ObjectId("5ca4bbc7a2dd94ee5816239d"),
  account_id: 864905,
  limit: 10000,
  products: [ 'Commodity', 'InvestmentStock' ]
},
{
  _id: ObjectId("5ca4bbc7a2dd94ee5816239e"),
  account_id: 299072,
  limit: 10000,
  products: [ 'InvestmentFund', 'InvestmentStock' ]
},
{
  _id: ObjectId("5ca4bbc7a2dd94ee5816239f"),
  account_id: 137994,
  limit: 10000,
  products: [ 'CurrencyService', 'InvestmentStock' ]
}
We need to use Aggregation Framework to find the distribution of products field. Sort the result set by decreasing total number of products.
Expected output:
[
    { _id: 'InvestmentStock', total: 1746 },
    { _id: 'CurrencyService', total: 742 },
    { _id: 'Brokerage', total: 741 },
    { _id: 'InvestmentFund', total: 728 },
    { _id: 'Commodity', total: 720 },
    { _id: 'Derivatives', total: 706 }
]
Which pipeline should you use?


Answer: B
Question 5

Which of the following statements are true regarding the MongoDB Aggregation Framework and pipelines? (Select two)


Answer: A,E
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Total 411 Questions | Updated On: Mar 08, 2026
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