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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q18-Q23):

NEW QUESTION # 18
Which of the following needs to be performed prior to initiate backup on a sharded cluster?

A. db.stopServer( )
B. db.stopBalancer( )
C. sh.stopServer( )
D. sh.stopBalancer( )

Answer: D

NEW QUESTION # 19
What is the correct read preference option to direct all read operations to the secondary?

A. secondariesPreferred
B. secondaryPreferred
C. secondary
D. secondaries

Answer: C

Explanation:
MongoDB read preference controls which replica-set members are eligible to serve read operations. The mode secondary sends reads only to eligible secondary members. If no suitable secondary is available, the read fails rather than falling back to the primary. That strict behavior is exactly what the question asks for.
secondaryPreferred, option A, normally routes reads to secondaries but can use the primary when no suitable secondary is available, so it does not guarantee that every read is served by a secondary. Options B and C are not valid MongoDB read preference mode names. Secondary reads are useful for specific workloads, but DBAs must account for asynchronous replication: a secondary can lag the primary, so data returned from a secondary may be stale relative to the latest acknowledged primary write. MongoDB provides additional controls such as tag sets and maximum staleness settings to restrict which secondary members are considered acceptable. When the explicit requirement is to direct all reads away from the primary and exclusively to secondary members, secondary is the correct read preference. Therefore option D is correct.
Study Guide reference/topic:Cluster Reliability and Data Resilience - replica-set read preferences, secondary reads, and staleness.

NEW QUESTION # 20
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: " $pop " } }
}] )
B. db.population.aggregate( [{ $group: { _id: { state: Estate " , city: " $city " },pop: { $sum: 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: " $state " , city: " $city " },pop: { $pop: 1 } } }] )

Answer: A

NEW QUESTION # 21
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. oplog.rs
B. <replicasetid>.oplog.rs
C. local.oplog.rs
D. <database>..oplog.rs

Answer: C

NEW QUESTION # 22
What is the maximum size of Index Key Limit and Number of Indexes per collection?

A. 64 bytes and 1024 indexes
B. 1024 bytes and unlimited indexes
C. 1024 bytes and 64 indexes
D. 12 mega bytes and 64 indexes

Answer: C

NEW QUESTION # 23
......

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