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Exam Overview
Exam Code C100DBA
Exam Name MongoDB Certified DBA Associate Exam
Vendor MongoDB
Total Questions 132
Last Updated 26-Oct, 2026
Free C100DBA Questions Get Premium Access
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Free C100DBA Practice Questions

Explore 5 free practice questions for the MongoDB C100DBA exam and review the answers and explanations to support your preparation.

  1. Question 1

    Multiple answers

    In which of the following scenarios is sharding not the correct option. Select all that apply.



    • Option A:

      The write operations on the collection are low


      Correct
    • Option B:

      The write operations on the collection are very high


      Correct
    • Option C:

      The working set in the collection is expected to grow very large in size


      Correct
    • Option D:

      The collection is a read intensive collection with less working set

      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: A, B

  2. Question 2

    Single answer

    The MongoDB explain() method does not support which of the following verbosity mode:

    • Option A:

      executionStats


      Correct
    • Option B:

      queryPlanner


      Correct
    • Option C:

      customExecutionStats

      Correct
    • Option D:

      allPlansExecution

      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: A

  3. Question 3

    Single answer

    MongoDB is

    • Option A:

      None of the above


      Correct
    • Option B:

      Object-oriented DBMS


      Correct
    • Option C:

      Relational DBMS


      Correct
    • Option D:

      Document-oriented DBMS

      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: D

  4. Question 4

    Single answer

    Which of the following aggregation commands in MongoDB does not support sharded collections?

    • Option A:

      mapReduce


      Correct
    • Option B:

      group


      Correct
    • Option C:

      aggregate

      Correct
    • Option D:

      All of the above

      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: B

  5. Question 5

    Single answer

    Which of the following collections stores authentication credentials in MongoDB?

    • Option A:

      test.users


      Correct
    • Option B:

      local.users


      Correct
    • Option C:

      system.users


      Correct
    • Option D:

      users.users

      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: C