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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q50-Q55):

NEW QUESTION # 50
Suposse tou have the following collection with only 2 documents:

If you run an aggregation query and use { $unwind: "$traits" } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?

Answer: D


NEW QUESTION # 51
What does the following aggregate query perform?

Answer: A


NEW QUESTION # 52
What is the maximum size of Index Key Limit and Number of Indexes per collection?

Answer: C


NEW QUESTION # 53
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?

Answer: B

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 # 54
Below is a sample document of "orders" collection

Answer: A


NEW QUESTION # 55
......

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