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MongoDB C100DBA Exam Syllabus Topics:

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

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

NEW QUESTION # 50
Below is a sample document of " orders " collection

Answer:

Explanation:
$project


NEW QUESTION # 51
What does the following $slice query return using the following command? db.posts.find( {}, { comments: {
$slice: [ -10, 5 ] } } )

Answer: B


NEW QUESTION # 52
A database administrator maintains a MongoDB database that stores scientific papers. A paper with DOI
10.1000/xyz123 is no longer relevant and needs to be removed.
What query should the administrator use to delete the paper with the DOI equal to 10.1000/xyz123?

Answer: C

Explanation:
db.collection.deleteOne() deletes a single document that matches the supplied filter, so the direct operation is db.scientificPapers.deleteOne({ doi: " 10.1000/xyz123 " }). The DOI is the identifying criterion, and no additional filter is required. Option A is dangerous and incorrect: drop() removes the entire collection and its indexes rather than deleting a filtered document. Option B uses findOneAndDelete(), which can delete a single matching document, but the displayed filter also requires a nonexistent or inappropriate field/value pair, scientificPapers: " orders " , so the target document would not match. Option D misunderstands the method signature. The second argument to deleteOne() is an options document for settings such as write concern, collation, or hint; it is not a second query predicate. In production, a unique index on DOI could also ensure that the business identifier is unique and make the deletion highly selective. Among the presented commands, only option C cleanly and correctly deletes the one scientific-paper document identified by the specified DOI.
Study Guide reference/topic:MongoDB Architecture and Core Operations - delete operations, deleteOne(), filters, and collection management.


NEW QUESTION # 53
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: B


NEW QUESTION # 54
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: D


NEW QUESTION # 55
......

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