C100DBA Mock Test - C100DBA Interactive Questions

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MongoDB C100DBA Exam Syllabus Topics:

Section	Objectives
Application Administration	- Security and Access Control 1. Role-Based Access Control 2. Authorization 3. User Management 4. Authentication
Indexes	- Index Management 1. Single Field Indexes 2. Compound Indexes 3. Query Performance Optimization 4. Index Selection
Server Administration	- Database Operations 1. Backup and Restore 2. Storage Management 3. Configuration Management 4. Monitoring
CRUD Operations	- Data Manipulation 1. Read Queries 2. Insert Operations 3. Update Operations 4. Delete Operations
Sharding	- Cluster Scaling 1. Query Routing 2. Shard Keys 3. Balancer Operations 4. Chunk Distribution
Philosophy and Features	- MongoDB Architecture 1. Scalability Concepts 2. High Availability Concepts 3. Document Model 4. Collections and Databases
Replication	- Replica Sets 1. Write Concerns 2. Primary and Secondary Nodes 3. Elections 4. Read Preferences

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Free PDF 2026 MongoDB - C100DBA - MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Mock Test

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q44-Q49):

NEW QUESTION # 44
What does the following aggregate query perform?

A. Calculates the number of posts with likes between 100 and 200
B. Fetches the posts with likes between 100 and 200, sets the _id of the first document as null and then increments it 1 every time
C. Fetches the posts with likes between 100 and 200 and sets their _id as null
D. Groups the posts by number of likes (101, 102, 103.) by adding 1 every time

Answer: A

NEW QUESTION # 45
In a sharded cluster, from which node does one stop the balancer process before initiating backup?

A. Any node
B. mongos node
C. config server node
D. replicaset primary node

Answer: B

NEW QUESTION # 46
A MongoDB database administrator is asked to add the privilege find to a role named myRole.
What is the correct syntax for adding this privilege to the role in MongoDB?

A. db.runCommand({grantPrivilegesToRole: " myRole " ,privileges: [{ db: " testDB " , collection: " " , actions: [ " find " ] }] ,writeConcern: { w: " majority " },comment: " Granting find action " })
B. db.runCommand({grantPrivilegesToRole: " myRole " ,privileges: {resource: { db: " testDB " , collection: " " }, actions: [ " find " ]},writeConcern: { w: " majority " },comment: " Granting find action
" })
C. db.runCommand({grantPrivilegesToRole: " myRole " ,privileges: [{ resource: { db: " testDB " , collection: " " }, actions: [ " find " ] }] ,writeConcern: { w: " majority " },comment: " Granting find action " })
D. db.runCommand({grantPrivilegesToRole: " myRole " ,privileges: [{ resource: { db: " testDB " , collection: " " }, actions: " find " }],writeConcern: { w: " majority " },comment: " Granting find action "
})

Answer: C

Explanation:
The grantPrivilegesToRole command requires privileges to be an array of privilege documents. Each privilege document must contain a resource document and an actions array. Option A uses exactly that structure: the resource targets testDB with an empty collection name, which represents the database-level collection scope used by MongoDB ' s privilege model, and the actions list contains " find " . Option B omits the required resource wrapper and incorrectly places db and collection directly in the privilege document. Option C supplies privileges as a single document rather than as the required array. Option D has the correct resource structure but supplies actions as a scalar string instead of an array. The find action grants the ability to perform supported read operations on the specified resource scope, subject to the role ' s other inherited privileges. The shown writeConcern and comment fields are legitimate command options and do not change the structural requirement. Consequently, option A is the only choice that conforms to MongoDB ' s documented privilege document format.
Study Guide reference/topic:Security, Networking, and Encryption - user-defined roles, privilege documents, resources, actions, and grantPrivilegesToRole.

NEW QUESTION # 47
What is the output of following two commands in MongoDB: db. posts. insert({n_id " :l}) db.posts.insert({ "
_id " :l})

A. MongoDB will automatically increment the _id of the second document as 2
B. This will throw a duplicate key error
C. It will insert two documents and throw a warning to the user
D. Two documents will be inserted with _id as 1

Answer: B

NEW QUESTION # 48
Below is a sample document of "orders" collection

Answer:

Explanation:
$sort

NEW QUESTION # 49
......

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