Free PDF 2026 MongoDB C100DBA: Latest New MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Study Materials

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MongoDB C100DBA Exam Syllabus Topics:

Section	Weight	Objectives
Replication and High Availability	15%	- Replica set architecture and components - Failover, elections, read/write concern - Deployment and maintenance of replica sets
Backup, Recovery and Maintenance	10%	- Restore procedures and disaster recovery - Logical and physical backup methods - Data consistency and integrity checks
Sharding and Scalability	10%	- Shard keys, chunk management, balancing - Query routing and cluster operations - Sharded cluster architecture
Monitoring, Performance and Troubleshooting	10%	- Performance tuning and optimization - Diagnostics and resolving common issues - Monitoring tools and metrics
CRUD Operations and Indexing	20%	- Create, Read, Update, Delete operations - Query optimization and aggregation - Index types, creation, and management
MongoDB Architecture and Deployment	20%	- Installation and configuration - Storage engines and server management - Core concepts, JSON/BSON, data model
Security and Access Control	15%	- Role-based access control - Authentication mechanisms - Encryption, auditing, and security best practices

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q137-Q142):

NEW QUESTION # 137
The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:

A. local.oplog.rs
B. <database>..oplog.rs
C. oplog.rs
D. <replicasetid>.oplog.rs

Answer: A

NEW QUESTION # 138
Which of the following operator can be used to control the number of items of an array that a query returns?

A. $
B. $slice
C. $ elemMatch
D. MongoDB does not support partial retrieval of items from an array

Answer: B

NEW QUESTION # 139
Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?

A. db.population.aggregate( [{ $group: { _id: { state: Estate " , city: " $city " },pop: { $sum: 1 > > > ] )
B. db.population.aggregate( [{ $group: { _id: { state: " $state " , city: " $city " },pop: { $pop: 1 } } }] )
C. db.population.aggregate( [{ $group: { _id: { city: " $city " },pop: { $sum: " $pop " } } }] )Multi Document Transaction is not supported by MongoDB
D. db.population.aggregate( [{ $group: { _id: { state: Estate " , city: " $city " },pop: { $sum: " $pop " } }
}] )

Answer: D

NEW QUESTION # 140
What is a limitation of encryption at rest?

A. It can impact performance greatly.
B. It does not protect against data breaches.
C. It protects against insecure network connections.
D. It requires a lot of additional configuration.

Answer: B

Explanation:
Encryption at rest protects persisted database data on storage media, but it is not a complete defense against every form of data exposure or breach. MongoDB ' s encrypted storage capabilities protect files and storage- level data, yet applications and the database server must still process authorized data in usable form. A compromised application account, stolen database credentials, excessive privileges, or a malicious authorized user can therefore expose data even when the underlying storage is encrypted. Network traffic also requires separate transport protection such as TLS; encryption at rest does not secure data as it travels between clients and servers. Option B incorrectly describes transport encryption rather than an at-rest capability. Option A is too subjective and not an inherent limitation, particularly in managed deployments where storage encryption may be enabled automatically. Option D is similarly overstated; encryption adds cryptographic work, but severe performance impact is not an intrinsic defining limitation. The correct security model is defense in depth: combine at-rest encryption with TLS, strong authentication, least-privilege authorization, auditing, and secure key management. Among the choices, C best captures the limitation that at-rest encryption alone cannot prevent all data breaches.
Study Guide reference/topic:Security, Networking, and Encryption - encryption at rest, TLS, authorization, and defense in depth.

NEW QUESTION # 141
Which is the default mode in which the explain() command runs?

A. customExecutionStats
B. executionStats
C. allPlansExecution
D. queryPlanner

Answer: D

NEW QUESTION # 142
......

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