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MongoDB C100DBA Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Replication and High Availability15%- Replica set architecture and components
- Deployment and maintenance of replica sets
- Failover, elections, read/write concern
Topic 2: Monitoring, Performance and Troubleshooting10%- Diagnostics and resolving common issues
- Performance tuning and optimization
- Monitoring tools and metrics
Topic 3: MongoDB Architecture and Deployment20%- Core concepts, JSON/BSON, data model
- Storage engines and server management
- Installation and configuration
Topic 4: CRUD Operations and Indexing20%- Create, Read, Update, Delete operations
- Query optimization and aggregation
- Index types, creation, and management
Topic 5: Backup, Recovery and Maintenance10%- Logical and physical backup methods
- Data consistency and integrity checks
- Restore procedures and disaster recovery
Topic 6: Security and Access Control15%- Authentication mechanisms
- Encryption, auditing, and security best practices
- Role-based access control
Topic 7: Sharding and Scalability10%- Shard keys, chunk management, balancing
- Query routing and cluster operations
- Sharded cluster architecture

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q172-Q177):

NEW QUESTION # 172
The following aggregation option is used to specify the specific fields that needs to be passed to the next stage of the aggregation pipeline:

Answer: B


NEW QUESTION # 173
A MongoDB administrator is managing a database for a hospital system.
The patients collection contains:
- Carlos Martinez, diagnosis Hypertension, room 203
- Maria Lopez, diagnosis Hypertension, room 207
- Juan Perez, diagnosis Arrhythmia, room 207
The administrator runs:
db.patients.updateMany(
{ diagnosis: " Hypertension " },
{ $set: { room: 207 } }
)
What output should the administrator expect?

Answer: B

Explanation:
updateMany() distinguishes between documents that match the filter and documents whose stored data actually changes. The filter { diagnosis: " Hypertension " } matches Carlos Martinez and Maria Lopez, so matchedCount is 2. Carlos currently has room: 203, and $set: { room: 207 } changes his document, contributing one to modifiedCount. Maria already has room: 207. She still satisfies the filter and therefore counts as a match, but setting a field to the value it already contains does not produce a material modification, so she does not increment modifiedCount. Juan Perez has diagnosis Arrhythmia, so he is neither matched nor modified. The resulting acknowledged operation therefore reports matchedCount: 2 and modifiedCount: 1, corresponding to option D. This distinction is essential when validating whether an update actually changed stored values rather than merely identifying matching records. This distinction is operationally important: a large difference between matched and modified counts can indicate that many matching documents already contained the requested state, not that the update failed. DBAs should use both counters when validating bulk- update behavior.
Study Guide reference/topic:MongoDB Architecture and Core Operations - updateMany(), $set, matchedCount, and modifiedCount.


NEW QUESTION # 174
Which of the following aggregate commands in MongoDB uses a pipeline approach with the goals of improving the aggregation performance?

Answer: A


NEW QUESTION # 175
Consider that our posts collection contains an array field called tags that contains tags that the user enters. {

Which of the following commands will find all the posts that have been tagged as tutorial.

Answer: C


NEW QUESTION # 176
Which of the following commands will return all the posts with number of likes greater than 100 and less than
200, both inclusive?

Answer: A


NEW QUESTION # 177
......

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