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C100DBA MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Free Practice Exam Questions (2025 Updated)

Prepare effectively for your MongoDB C100DBA MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) certification with our extensive collection of free, high-quality practice questions. Each question is designed to mirror the actual exam format and objectives, complete with comprehensive answers and detailed explanations. Our materials are regularly updated for 2025, ensuring you have the most current resources to build confidence and succeed on your first attempt.

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Total 132 questions

In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal. What should be the value of j?

A.

1

B.

2

C.

0

D.

7

Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called "sample". Check all that apply.

db.sample.find( { "$or" : [ { "a" : { "$in" : [ 3, 10] > }, { "b" : { "$lt" : 2 > > ] > )

A.

{''__id" :3, "a": 4, "c" :0, "b" :14}

B.

{''_Jd" :7, "a": 8, "c" :1, "b" :7}

C.

{".Jd" :6, "a": 1, "c" :1, "b" :5}

D.

{ ''\Jd" :9, "a": 17, "c": 1, "b": 1}

E.

{ \Jd" :10,"a": 3, "c": 1, "b": 1}

F.

{".Jd" :: 2, "a": 2, "c" :: 0, "b": 1}

G.

{".Jd" :: 4, "a": 5, "c" :: 0, "b": 17}

Which command is used to determine storage capacity of specific database?

A.

mongotop

B.

dbstats

C.

mongostat

D.

constats

When should we consider representing a one-to-many relationship in an embedded collection instead of separate collection?

A.

When the many is not very large

B.

When the many is very large

C.

Always

D.

Never

Which of the following operators is used to updated a document partially?

A.

$set

B.

$update

C.

$project

D.

$modify

What is the defau size of a GridFS chunk?

A.

255 K

B.

1 MB

C.

16 MB

D.

2 MB

Given a replica set with five data-bearing members, suppose the primary goes down with operations in its oplog that have been copied from the primary to only one secondary. Assuming no other problems occur, which of the following describes what is most likely to happen?

A.

missing operations will need to be manually re-performed

B.

the secondary with the most current oplog will be elected primary

C.

reads will be stale until the primary comes back up

D.

the primary may roll back the operations once it recovers

E.

the most current secondary will roll back the operations following the election

In a sharded cluster, from which node does one stop the balancer process before initiating backup?

A.

Any node

B.

replicaset primary node

C.

config server node

D.

mongos node

By default, the MongoDB cursor in mongo shell is configured to return how many documents? To get the next set of documents, which command is used?

A.

200, more

B.

No limit, none

C.

20, it

D.

50, it

Update If Correct is an approach for which of the following concepts in MongoDB:

A.

Concurrency Control

B.

Atomicity

C.

Performance Management

D.

Transaction Management

Which of the following does MongoDB use to provide High Scalability?

A.

Replication

B.

Write Concern

C.

Indexing

D.

Sharding

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

Which of the following node is used during election in a replication cluster?

A.

primary

B.

arbiter

C.

hidden

D.

secondary

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

A.

executionStats

B.

queryPlanner

C.

customExecutionStats

D.

allPlansExecution

Which mongodb tool is used to report details on number of database operations in MongoDB?

A.

mongorestore

B.

mongostat

C.

mongodump

D.

mongotop

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

Which of the following is supported by MongoDB?

A.

Transaction Management

B.

ACID Transactions

C.

Journaling

D.

Relationships between Collections (Primary Key Foreign Key)

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

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

Which format/standard is used by MongoDB internally to store documents?

A.

JSON

B.

BSON

C.

B+ Trees

D.

JSON - Extended

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