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MongoDB C100DBA Exam Syllabus Topics:

Section	Weight	Objectives
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 - Sharded cluster architecture - Query routing and cluster operations
Replication and High Availability	15%	- Replica set architecture and components - Deployment and maintenance of replica sets - Failover, elections, read/write concern
CRUD Operations and Indexing	20%	- Create, Read, Update, Delete operations - Index types, creation, and management - Query optimization and aggregation
MongoDB Architecture and Deployment	20%	- Core concepts, JSON/BSON, data model - Storage engines and server management - Installation and configuration
Security and Access Control	15%	- Authentication mechanisms - Role-based access control - Encryption, auditing, and security best practices
Monitoring, Performance and Troubleshooting	10%	- Monitoring tools and metrics - Performance tuning and optimization - Diagnostics and resolving common issues

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q26-Q31):

NEW QUESTION # 26
What command set removes node-1.cluster1.mycompany.local:27017 and node-2.cluster1.mycompany.local:
27017 from the replica set, then adds node-1.cluster1.mycompany.local:27017 back to the replica set?

A. rs.remove( " node-1.cluster1.mycompany.local:27017 " )rs.remove( " node-2.cluster1.mycompany.local:
27017 " )rs.add({ host: " node-1.cluster1.mycompany.local:27017 " })
B. rs.removeNode( " node-1.cluster1.mycompany.local:27017 " )rs.removeNode( " node-2.cluster1.
mycompany.local:27017 " )rs.addNode({ host: " node-1.cluster1.mycompany.local:27017 " })
C. rs.remove( " node-1.cluster1.mycompany.local:27017 " )rs.remove( " node-2.cluster1.mycompany.local:
27017 " )rs.addNode({ host: " node-1.cluster1.mycompany.local:27017 " })
D. rs.removeNode( " node-1.cluster1.mycompany.local:27017 " )rs.removeNode( " node-2.cluster1.
mycompany.local:27017 " )rs.add({ host: " node-1.cluster1.mycompany.local:27017 " })

Answer: A

Explanation:
The supported mongosh helpers for replica-set membership changes are rs.remove() and rs.add(). rs.remove (hostname) removes the member whose host string matches the supplied host:port, while rs.add() adds a new member using either a host string or a member configuration document that includes a host field. Option C uses those documented methods in the required sequence: remove node 1, remove node 2, then add node 1 back. The names rs.removeNode() and rs.addNode() shown in the other options are not standard MongoDB replica-set helper methods. Membership changes must be performed carefully because modifying voting or data-bearing membership can affect majority calculations, elections, and availability. Administrators normally execute membership changes while connected to the current primary, allow configuration propagation, and verify replica-set health afterward with rs.status() or related diagnostics. If a removed data-bearing node is later re-added, it may need to synchronize depending on how far its data has diverged from the current replica- set history. Among the choices, option C is the only valid command sequence.
Study Guide reference/topic:Cluster Reliability and Data Resilience - replica-set membership, rs.remove(), rs.
add(), and topology changes.

NEW QUESTION # 27
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. {".Jd" :: 1, "a": 0, "c" :: 0, "b": 2}
B. { ''\Jd" :9, "a": 17, "c": 1, "b": 1}
C. {".Jd" :6, "a": 1, "c" :1, "b" :5}
D. {".Jd" :: 8, "a": 11, "c": 1, "b": 0}
E. {''_Jd" :7, "a": 8, "c" :1, "b" :7}
F. { \Jd" :10,"a": 3, "c": 1, "b": 1}
G. {''__id" :3, "a": 4, "c" :0, "b" :14}
H. {".Jd" :: 4, "a": 5, "c" :: 0, "b": 17}
I. {".Jd" :: 5, "a": 3, "c" :: 0, "b": 12}
J. {".Jd" :: 2, "a": 2, "c" :: 0, "b": 1}

Answer: B,D,F,I,J

NEW QUESTION # 28
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. 20, it
B. 50, it
C. 200, more
D. No limit, none

Answer: A

NEW QUESTION # 29
Consider a collection posts which has fields: Jd, post_text, post_author, post_timestamp, post_tags etc.
Which of the following query retrieves ONLY the key named post_text from the first document retrieved?

A. db.posts.finOne({},{_id:0, post_text:1})
B. db.posts.finOne({},{post_text:1})
C. db.posts.findOne({post_text: 1})
D. db.posts.find({},{_id:Of post_text:1})

Answer: A

NEW QUESTION # 30
Which of the following is true about aggregation framework?

A. A single aggregation framework operator can be used more than once in a query
B. the aggregate command operates on a multiple collection
C. Each aggregation operator need to return atleast one of more documents as a result
D. Pipeline expressions are stateless except accumulator expressions used with $group operator

Answer: A,C,D

NEW QUESTION # 31
......

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