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MongoDB C100DBA Exam Syllabus Topics:

Section	Objectives
Indexing and Performance Tuning	- Explain plans and diagnostics - Index types and usage - Query performance optimization
Replication and High Availability	- Read/write concerns - Failover and elections - Replica set architecture
Backup, Restore, and Operations	- Backup strategies and tools - Monitoring and maintenance - Restore procedures
Sharding and Scalability	- Shard keys and distribution strategy - Balancing and scaling operations - Sharded cluster architecture
Aggregation Framework	- Data transformation and grouping - Aggregation operators - Aggregation pipeline stages
Data Modeling	- Relationships in MongoDB - Schema design principles - Embedding vs referencing
MongoDB CRUD Operations	- Insert, update, and delete operations - Querying and filtering documents - Working with documents and BSON types
Security	- Authentication and authorization - Encryption at rest and in transit - Role-based access control (RBAC)

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q95-Q100):

NEW QUESTION # 95
Which of the following operator can be used to control the number of items of an array that a query returns?

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

Answer: A

NEW QUESTION # 96
Which type of indexes does MongoDB support?

A. Geospatial Indexes
B. All of the above
C. Compound Indexes
D. Multikey Indexes

Answer: B

NEW QUESTION # 97
In a replica set with a primary and two secondaries, what should the write concern be set to so only a single node is required to acknowledge a write operation before it is deemed successful?

A. { writeConcern: { w: " 1 " } }
B. { writeConcern: " 1 " }
C. { writeConcern: 1 }
D. { writeConcern: { w: 1 } }

Answer: D

Explanation:
MongoDB write concern defines the level of acknowledgment requested for a write. Setting the numeric value w: 1 means that a write is considered acknowledged after the primary has accepted it; no secondary acknowledgment is required. In a replica set with one primary and two secondaries, those secondaries can replicate the operation asynchronously after the client has already received success. That configuration is represented by { writeConcern: { w: 1 } }, making option D correct. The numeric type matters: w can be specified as an integer count or certain strings such as " majority " , but the string " 1 " is not the intended numeric node count shown by the question. Options B and C also omit the w field structure expected inside a write concern document. The durability trade-off is important: a w:1 write can be acknowledged before any secondary has replicated it, so a sudden primary failure before replication may result in that write being rolled back after failover. If the workload requires stronger durability, w: " majority " is commonly used. For exactly one acknowledging node, however, the correct setting is D.
Study Guide reference/topic:Cluster Reliability and Data Resilience - write concern, w acknowledgments, replica-set durability, and rollback risk.

NEW QUESTION # 98
What is a limitation of encryption at rest?

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

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 # 99
Consider the following posts document:

Which of the following queries will return the documents but with only the first two tags in the tags array?

A. Both "db.posts.find({author:"Tom"},{tags:{$slice:2}})" and
"db.posts.find({author:"Tom"}).limit($slice: {tags:2})" are valid. $slice works both with projection and limit.
B. db.posts.find({author:"Tom">,{tags:{$slice:2})
C. db.posts.find({author:"Tom"}.limit({tags:2})
D. db.posts.find({author:"Tom"}.limit($slice:{tags:2>)

Answer: B

NEW QUESTION # 100
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