- A
Set up MongoDB replica set to replicate directly to DocumentDB.
Why wrong: DocumentDB does not support native replication from MongoDB.
- B
Use AWS DMS with MongoDB as source and DocumentDB as target, enabling ongoing replication.
DMS supports homogeneous migration with minimal downtime.
- C
Use AWS Schema Conversion Tool (SCT) to convert the schema, then manually migrate data.
Why wrong: SCT is for schema conversion, not data migration for DocumentDB.
- D
Export data using mongodump and import using mongorestore.
Why wrong: Does not handle sharding well and causes downtime.
Question 131 of 1,730
DBS-C01 Deployment and Migration 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. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 planning to migrate a MongoDB database to Amazon DocumentDB. The database has several sharded collections. Which migration strategy should be used?
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 MongoDB as source and DocumentDB as target, enabling ongoing replication.
AWS DMS supports MongoDB as a source and Amazon DocumentDB as a target, and it can perform ongoing replication (change data capture) to keep the target synchronized with the source during migration. This is essential for sharded MongoDB collections because it minimizes downtime by allowing the source to remain operational while data is migrated and changes are continuously applied.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set up MongoDB replica set to replicate directly to DocumentDB.
Why it's wrong here
DocumentDB does not support native replication from MongoDB.
- ✓
Use AWS DMS with MongoDB as source and DocumentDB as target, enabling ongoing replication.
Why this is correct
DMS supports homogeneous migration with minimal downtime.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS Schema Conversion Tool (SCT) to convert the schema, then manually migrate data.
Why it's wrong here
SCT is for schema conversion, not data migration for DocumentDB.
- ✗
Export data using mongodump and import using mongorestore.
Why it's wrong here
Does not handle sharding well and causes downtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume a simple dump-and-restore (Option D) is sufficient for sharded collections, overlooking the need for minimal downtime and ongoing replication that AWS DMS provides.
Detailed technical explanation
How to think about this question
AWS DMS for MongoDB to DocumentDB uses the MongoDB oplog to capture ongoing changes, enabling near-zero downtime migration. For sharded collections, DMS can handle the complexity by connecting to each shard or the mongos router, but it requires that the source MongoDB be configured with a replica set (even for sharded clusters) to access the oplog. The migration can be performed in full-load plus CDC mode, where the initial data is copied and then changes are applied until cutover.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
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Deployment and Migration — study guide chapter
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS DMS with MongoDB as source and DocumentDB as target, enabling ongoing replication. — AWS DMS supports MongoDB as a source and Amazon DocumentDB as a target, and it can perform ongoing replication (change data capture) to keep the target synchronized with the source during migration. This is essential for sharded MongoDB collections because it minimizes downtime by allowing the source to remain operational while data is migrated and changes are continuously applied.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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