C100DBA Application Administration Practice Question
Which MongoDB feature allows an application to receive real-time updates when data changes in a collection?
⚠ Common exam trap
Test-takers frequently confuse Change Streams with regular polling mechanisms or database triggers, failing to realize Change Streams use the aggregation framework for real-time reactive updates.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Change Streams
Change Streams provide an event-driven way for applications to react to data modifications in real time without polling the database. By using the aggregation framework, applications can filter for specific events like inserts, updates, or deletes. This is vital for modern microservices architectures, as it allows downstream systems to keep their caches or search indexes synchronized with the primary data store immediately after a write occurs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Capped collections
Why it's wrong here
Capped collections are used to store data in a fixed-size circular buffer. While they can be used for tailing logs, they are not a real-time event-streaming mechanism for general purpose collections. Change streams are the modern, standard way to watch for changes across any collection regardless of its storage configuration.
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Database Profiler
Why it's wrong here
The database profiler is a diagnostic tool used to record information about slow queries. It is not designed for application-level data streaming or responding to document updates. Using the profiler for data integration would be inefficient, insecure, and would cause massive overhead on the database server during high-load operations.
- ✓
Change Streams
Why this is correct
Change Streams allow applications to subscribe to a collection or database and receive notifications whenever a change occurs. This feature is built on top of the oplog and provides a robust, scalable way to implement event-driven architectures, ensuring that the application can react to data changes as they happen.
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GridFS
Why it's wrong here
GridFS is a specification for storing large files in MongoDB. It breaks large binary objects into smaller chunks across documents. It has no capability to monitor data changes or provide real-time event notifications to the application; it is strictly a storage mechanism for files that exceed the document size limit.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official MongoDB exam blueprint
This C100DBA practice question is part of Courseiva's free MongoDB certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the C100DBA exam.