MongoDB Associate Database Administrator

Here you have the best MongoDB C100DBA practice exam questions

  • You have 152 total questions across 31 pages (5 per page)
  • These questions were last updated on April 21, 2026
  • This site is not affiliated with or endorsed by MongoDB.
Question 1 of 152

An Atlas Sample Dataset of restaurants is loaded into a database deployment.How is Data Explorer used to find all restaurants whose name is “The Rose Palace” in the Restaurants database?

Answer

Suggested Answer

The suggested answer is B.

Question 2 of 152

Given the following query:

db.coll.find({}).sort({“income”: 1, “tax”: -1})

Which two indexes will improve the performance of this query the most? (Choose two.)

Answer

Suggested Answer

The suggested answer is B, C.

Question 3 of 152

Given the following sample documents:{_id:1, company: “Farm Inc.”, active: true},

{_id:2, company: “Garden Inc.”, active: false} A developer wants to create a search query to search for a company. There is a business requirement to accommodate misspellings. An Atlas Search index has already been created for this query. What query satisfies these requirements?

Answer

Suggested Answer

The suggested answer is C.

Question 4 of 152

Given the following documents in a collection:

{_id:1, a: “one”, b: “two”}

{_id:2, a: “two”, b: “three”}

{_id:3, a: “one”, b: “four”, c: “three”}

Using the following update command: db.coll.replaceOne({a: “one”}, {d: “two”, b: “five”})

What would the contents of the collection be after successfully running this command?

Answer

Suggested Answer

The suggested answer is A.

Question 5 of 152

Given the following match expression:

{“c”: {$eq: “Green”}, “a”: {$gt: 3}}

{ _id: 1, p: 0.75, c: ‘Green’, a: [1,3,5,7]},

{ _id: 2, p: 0.80, c: ‘Orange, a: [1,3]},

{ _id: 3, p: 0.13, c: [‘Green’, ‘Orange’], a: [3]},

{ _id: 4, p: 0.00, c: ‘Green’, a: [5,7]},

{ _id: 5, p: 0.04, c: ‘Green’, a: 3},

{ _id: 6, p: 0.97, c: ‘Red, a:5}

What document will be returned from this expression?

Answer

Suggested Answer

The suggested answer is D.

About the MongoDB C100DBA Certification Exam

About the Exam

The MongoDB C100DBA (MongoDB Associate Database Administrator) validates your knowledge and skills. Passing demonstrates proficiency and can boost your career prospects in the field.

How to Prepare

Work through all 152 practice questions across 31 pages. Focus on understanding the reasoning behind each answer rather than memorizing responses to be ready for any variation on the real exam.

Why Practice Exams?

Practice exams help you familiarize yourself with the question format, manage your time, and reduce anxiety on the test day. Our C100DBA questions are regularly updated to reflect the latest exam objectives.