MongoDB C100DBA practice materials Questions Answers

Exam Code:
C100DBA
Exam Name:
MongoDB Certified DBA Associate Exam
Last Update:
Jun 01,2026

132 Questions Answers Verified by Experts!


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MongoDB C100DBA Questions for Certified DBA Associate Certification Exam 2026

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Total Questions: 131

Questions & Answers PDF

• Question 1

  

  What tool do you use to see if you have a problem in the consumption of disk I / 0?

  Reveal Answer Answer: Mongoperf Next Question

• Question 2

  

  The________operator can be used to identify an element in the array to be updated without explicitly specifyingthe position of the element.

  • $ elemMatch
  • $slice
  • Updating an array field without knowing its index is not possible.
  • $

  Reveal Answer Answer: D Next Question

• Question 3

  

  Which of the following is true about aggregation framework?

  • Each aggregation operator need to return atleast one of more documents as a result
  • the aggregate command operates on a multiple collection
  • A single aggregation framework operator can be used more than once in a query
  • Pipeline expressions are stateless except accumulator expressions used with $group operator

  Reveal Answer Answer: A, C, D Next Question

• Question 4

  

  Which of the following commands can cause the database to be locked?

  • All of the above
  • Inserting data
  • Map-reduce
  • Issuing a query

  Reveal Answer Answer: A Next Question

• Question 5

  

  In a sharded replicas set environment with multiple mongos servers, which of the following would decide the mongos failover?

  • mongos
  • mongo shell
  • individual language drivers
  • mongod

  Reveal Answer Answer: C Next Question

• Question 6

  

  Below is a sample document in a given collection test.{ a : 5, b : 3, c: 2, d : 1 >Given a compound index { a: 1, b:l, c:l, d:l}, Which of the below query will not use in-memory sorting? Selectall valid.

  • db.test.find( { a: 5, b: 3 } ).sort( { c: 1, d : 1 } )
  • db.test.find( { a: 5, b: 3 } ).sort( { a: 1} )
  • db.test.find( { a: 5, b: 3 } ).sort( { a: 1, b: 1, c: 1 > )
  • db.test.find( { a: 5, b: 3 } ).sort( {c: 1 } )

  Reveal Answer Answer: A, D Next Question

• Question 7

  

  Which of the following is a valid Replica Set configuration if you want:1-Have 3 copies of everything2- That RS3 is never primary2- That RSI and RS2 can be primary?You had to see the different configurations, RS3 could be hidden or priority 0 (But not a referee because we need3 replicas), while RSI and RS2 could NOT have priority 0 or be hidden or anything like thatIn a 4-member RS RSO , RSI, RS2 and RS3 + Referee, RSO (primary) falls after some write operations that havereplicated RSI and RS2 (but NOT RS3), who can get up as the new primary?The configuration comes and in it we see that RS2 has a hidden: true (or a priority: 0, (I don't remember)

  • ORS1
  • ORS2
  • ORS3
  • O arbiter
  • RSO

  Reveal Answer Answer: A Next Question

• Question 8

  

  You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?

  • A document will be inserted with the same _id as the last document inserted
  • A document that matches the collection's existing schema, but with null fields
  • A document with an _id assigned to be an Objectld
  • An empty document
  • No document will be inserted; an error will be raised

  Reveal Answer Answer: C Next Question

• Question 9

  

  You have designed a web application with mongoDB. You have configured replication. The replica set is in place and function properly. What happens in case of failure?

  • Switchover needs to be done manually
  • Failover happens automatically
  • Switchover happens automatically
  • Failover needs to be done manually

  Reveal Answer Answer: B Next Question

• Question 10

  

  Dada una coleccion, cuales devuelve con la siguiente query db.coleccion.find({nombre:'ruben',apellido:'gomez'},{nombre:l,apellido:l,aficion:l});

  • { '-id' : Objectld('580a42b5dfblb5al7427d302'), 'nombre' : 'ruben', 'apellido' : 'gomez', 'aficion' : v u 'flipar' }
  • { '_id' : Objectld('580a42acdfblb5al7427d301'), 'nombre' : 'Luis', 'apellido' : 'gomez', 'aficion' : u 'flipar' }
  • { '_id' : Objectld('580a42acdfblb5al7427d301'), 'nombre' : 'ruben', 'apellido' : 'Pablo' , 'aficion' : u 'flipar'}
  • { '_id' : Objectld('580a42acdfblb5al7427d301'), 'nombre' : 'ruben', 'apellido' : 'gomez' >

  Reveal Answer Answer: A, D Next Question

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Total Questions: 131

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