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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q122-Q127):

NEW QUESTION # 122
Which of the following is supported by MongoDB?

Answer: A


NEW QUESTION # 123
We can insert multiple documents in bulk using which of the following operations:

Answer: C


NEW QUESTION # 124
What encoded format does MongoDB store documents in?

Answer: A

Explanation:
MongoDB stores records as BSON documents. BSON, short for Binary JSON, is a binary serialization format that preserves the JSON-like document model while supporting a richer set of data types required by database applications. Mongosh commonly displays documents using JavaScript or Extended JSON-like notation, which is why JSON is a tempting distractor, but the native stored representation is BSON. BSON supports types such as ObjectId, dates, binary data, timestamps, Decimal128, 32-bit and 64-bit integers, arrays, embedded documents, and other values that standard JSON does not represent natively. Base64 is an encoding technique often used to render binary data as text and is not MongoDB ' s document storage format.
XML is also unrelated to MongoDB ' s native representation. Understanding BSON is fundamental for database administrators because document-size limits, type comparisons, index keys, serialization behavior, and driver interoperability all depend on BSON semantics. The flexible document model allows fields to contain scalar values, nested documents, and arrays within the same record structure. Therefore the encoded format used by MongoDB to store documents is BSON, making option C correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - BSON, document structure, data types, and JSON/BSON distinctions.


NEW QUESTION # 125
Which of the following needs to be performed prior to initiate backup on a sharded cluster?

Answer: B


NEW QUESTION # 126
Which is the default mode in which the explain() command runs?

Answer: B


NEW QUESTION # 127
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