- A
Use AWS DMS with ongoing replication from MongoDB to DocumentDB.
Correct. AWS DMS supports ongoing replication from MongoDB to DocumentDB using CDC, allowing for an online migration with minimal downtime.
- B
Use a custom application to capture MongoDB oplog changes and apply to DocumentDB.
Why wrong: Incorrect. While a custom application could theoretically work, it is unnecessary because DMS already provides CDC capabilities for this migration, making it a more complex and less reliable approach.
- C
Configure DocumentDB as a replica of the MongoDB primary.
Why wrong: Incorrect. DocumentDB cannot be configured as a replica of a MongoDB primary; they are separate systems with different replication mechanisms.
- D
Export MongoDB collection data to JSON files, then import into DocumentDB.
Why wrong: Incorrect. Exporting to JSON and importing is an offline approach, not suitable for minimal downtime migration.
DBS-C01 AWS DMS CDC Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. A key principle to apply: aWS DMS CDC. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is migrating a self-hosted MongoDB replica set to Amazon DocumentDB. The source MongoDB is version 4.0, and the target DocumentDB is 3.6. The migration must be online with minimal downtime. Which approach should be taken?
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
Use AWS DMS with ongoing replication from MongoDB to DocumentDB.
AWS DMS supports ongoing replication (change data capture) from MongoDB to Amazon DocumentDB. It can capture changes from the MongoDB oplog and apply them to DocumentDB in near real-time, enabling an online migration with minimal downtime. Option B is incorrect because using a custom application to capture oplog changes is unnecessary and more complex, as DMS provides built-in CDC functionality for this migration path.
Key principle: AWS DMS CDC
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use AWS DMS with ongoing replication from MongoDB to DocumentDB.
Why this is correct
Correct. AWS DMS supports ongoing replication from MongoDB to DocumentDB using CDC, allowing for an online migration with minimal downtime.
Related concept
AWS DMS CDC
- ✗
Use a custom application to capture MongoDB oplog changes and apply to DocumentDB.
Why it's wrong here
Incorrect. While a custom application could theoretically work, it is unnecessary because DMS already provides CDC capabilities for this migration, making it a more complex and less reliable approach.
- ✗
Configure DocumentDB as a replica of the MongoDB primary.
Why it's wrong here
Incorrect. DocumentDB cannot be configured as a replica of a MongoDB primary; they are separate systems with different replication mechanisms.
- ✗
Export MongoDB collection data to JSON files, then import into DocumentDB.
Why it's wrong here
Incorrect. Exporting to JSON and importing is an offline approach, not suitable for minimal downtime migration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates might think DMS does not support CDC from MongoDB to DocumentDB, but DMS actually does support this scenario. They may overcomplicate the solution by considering custom applications or other approaches.
Detailed technical explanation
How to think about this question
MongoDB's oplog (capped collection in the local database) records all write operations, and a custom application can tail this oplog using MongoDB change streams or direct oplog queries to capture inserts, updates, and deletes. The application then transforms these operations into DocumentDB-compatible commands, applying them via the DocumentDB API. This approach requires careful handling of idempotency and conflict resolution, especially during cutover, to ensure data consistency.
KKey Concepts to Remember
- AWS DMS CDC
- MongoDB oplog
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
AWS DMS CDC
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. AWS DMS CDC Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review aWS DMS CDC, then practise related DBS-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Deployment and Migration — This question tests Deployment and Migration — AWS DMS CDC.
What is the correct answer to this question?
The correct answer is: Use AWS DMS with ongoing replication from MongoDB to DocumentDB. — AWS DMS supports ongoing replication (change data capture) from MongoDB to Amazon DocumentDB. It can capture changes from the MongoDB oplog and apply them to DocumentDB in near real-time, enabling an online migration with minimal downtime. Option B is incorrect because using a custom application to capture oplog changes is unnecessary and more complex, as DMS provides built-in CDC functionality for this migration path.
What should I do if I get this DBS-C01 question wrong?
Review aWS DMS CDC, then practise related DBS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
AWS DMS CDC
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Last reviewed: Jul 4, 2026
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