MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4)
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Exam Code
C100DBA
Exam Name
MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4)
Questions
132 Questions Answers With Explanation
Update Date
04, 20, 2026
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MongoDB C100DBA Sample Question Answers
Question # 1
Which of the following does MongoDB use to provide High Availability and fault tolerance?
A. Sharding B. Indexing C. Replication D. Write Concern
Answer: C
Question # 2
Which of the following node is used during election in a replication cluster?
A. primary B. arbiter C. hidden D. secondary
Answer: B
Question # 3
Which of the following index would be optimum for the query?
Select all valid. db.test.find( { a : 5, c : 2 })
A. db.test.ensurelndex( { c:l, a: 1}) B. db.test.ensurelndex( { a : 1, c: 1, d: 1, b : 1}) C. CH db.test.ensurelndex( { a :1, c:l}) D. db.test.ensurelndex( { a: 1, b :1, c:l, d:l})
Answer: B, C
Question # 4
Mongodb does provide high availability via which option?
A. Replication B. Indexing C. Sharding D. Journaling
Answer: A
Question # 5
The MongoDB explain() method does not support which of the following verbosity mode:
A. executionStats B. queryPlanner C. customExecutionStats D. allPlansExecution
Answer: A
Question # 6
The MongoDB explain() method does not support which of the following verbosity mode:
A. executionStats B. queryPlanner C. customExecutionStats D. allPlansExecution
Answer: C
Question # 7
What is the equivalent command in MongoDB for the following SQL query?
SELECT * FROM posts WHERE author like "%john%"
A. db.posts.find( { author: /John/ } ) B. db.posts.find( { author: /AjohnA/ > ) C. db.posts.find( { $like: {author: /John/} } ) D. db.posts.find( { author: {$like: /John/} } )
Answer: A
Question # 8
Which option can be used with update command so that a new document gets created if no
matching document is found based on the query condition?
A. upsert command instead of update command B. {update: true, insert: true} as the third parameter of update command C. This has to be handled in application code (Node.js, PHP, JAVA, C#, etc.) and cannot be handled in mongo shell query D. Specify {upsert : true } as the third parameter of update command
Answer: D
Question # 9
Which of the following about Capped Collections is correct?
A. Fixed Size B. Only "Fixed Size" and "High-throughput operations that insert and retrieve documents based on insertion order" C. High-throughput operations that insert and retrieve documents based on insertion order D. If the allocated space for a capped collection exceeds, it stops inserting new documents
Answer: B QUESTIO
Question # 10
As per the aggregation pipeline optimization concepts, if you have a $sort followed by a $match:
A. Providing these parameters in any order does not impact the performance B. $sort moves before $match C. MongoDB does not do any movements by default and will use the order provided D. $match moves before $sort
Answer: D
Question # 11
What does the following $slice query return using the following command? db.posts.find( {}, {
comments: { $slice: [ -10, 5 ] } } )
A. Returns 5 comments, beginning with the last 10 items B. Returns 10 comments, beginning with the last C. Returns 10 comments, beginning with the first D. Returns 5 comments, beginning with the first 10 items
Answer: A
Question # 12
In a replica set, a_________number of members ensures that the replica set is always able to select
a primary.
A. Even B. Odd C. 2 D. Depends on the application architecture
Answer: B
Question # 13
Which of the following operators is used to updated a document partially?
A. $set B. $update C. $project D. $modify
Answer: A
Question # 14
Which is the default mode in which the explain() command runs?
A. allPlansExecution B. customExecutionStats C. queryPlanner D. executionStats
Answer: C
Question # 15
Which is the correct order (lowest to highest) in which MongoDB compares the BSON types?
A. Number, Null, String and Object B. Null, Number, Object and String C. Null, Number, String and Object D. String, Null, Number and Object
Answer: C
Question # 16
Which of the following aggregation commands in MongoDB does not support sharded collections?
A. mapReduce B. group C. aggregate D. All of the above
Answer: B
Question # 17
What does the following query do when performed on the posts collection?
db.posts.update({_id:l},{Title:This is post with ID 1"})
A. Syntax error B. Replaces the complete document with _id as 1 with the document specified in second parameter C. Updates the Title of the post D. Updating a document is possible only with $set
Answer: B
Question # 18
Which of the following collections stores authentication credentials in MongoDB?
A. test.users B. local.users C. system.users D. users.users
Answer: C
Question # 19
Which command can be used to rebuild the indexes on a collection in MongoDB?
A. db.collection.createlndex({relndex:l}) B. db.collection.reIndex({author:l}) C. db.collection.relndexQ D. db.collection.createIndex({author:l}).reIndex()
Answer: C
Question # 20
The________operator can be used to identify an element in the array to be updated without
explicitly specifying
the position of the element.
A. $ elemMatch B. $slice C. Updating an array field without knowing its index is not possible. D. $
Answer: D
Question # 21
Which of the following operator can be used to limit the number of documents in an array field of a
document after an update is performed?
A. $arrayLimit B. $push along with $each, $sort and $slice C. $removeFromSet D. None of the above
Answer: B
Question # 22
Which mongodb tool is used to report details on number of database operations in MongoDB?
A. mongorestore B. mongostat C. mongodump D. mongotop
Answer: B
Question # 23
Which of the following is correct about MongoDB?
A. MongoDB supports geospatial indexes B. MongoDB supports some of the SQL functions C. MongoDB uses JSON format to represent documents D. MongoDB supports collection joins
Answer: A
Question # 24
JSON stands for
A. JavaScript Object Notation B. JavaScript Object Naming C. JavaScript Object Notice D. None of the above
Answer: A
Question # 25
JSON stands for
A. JavaScript Object Notation B. JavaScript Object Naming C. JavaScript Object Notice D. None of the above
Answer: A
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