- A
Write a custom script to migrate data in batches
Why wrong: Complex and error-prone.
- B
Export data from MongoDB, upload to S3, and import into DocumentDB
Why wrong: Significant downtime.
- C
Use AWS DMS with ongoing replication from MongoDB to DocumentDB
Minimal downtime with live migration.
- D
Use AWS DataSync to transfer data files
Why wrong: Not suitable for database migration.
Question 1,453 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 developer needs to migrate a 500 GB MongoDB database to Amazon DocumentDB. Which approach will minimize application downtime?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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 with ongoing replication (change data capture) allows you to perform a full load of the existing 500 GB MongoDB data into DocumentDB while continuously replicating new changes from the source. This minimizes application downtime because you can cut over to DocumentDB only after the target is fully synchronized, rather than taking the source offline for the entire migration duration.
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.
- ✗
Write a custom script to migrate data in batches
Why it's wrong here
Complex and error-prone.
- ✗
Export data from MongoDB, upload to S3, and import into DocumentDB
Why it's wrong here
Significant downtime.
- ✓
Use AWS DMS with ongoing replication from MongoDB to DocumentDB
Why this is correct
Minimal downtime with live migration.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS DataSync to transfer data files
Why it's wrong here
Not suitable for database migration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Option B (export/import) because it seems straightforward, but they overlook the need for ongoing replication to minimize downtime, which is the key requirement in the question.
Detailed technical explanation
How to think about this question
AWS DMS uses a MongoDB source endpoint configured with replication instance settings to perform a full load via the MongoDB aggregation pipeline and then switches to CDC by reading the MongoDB oplog. The oplog captures all insert, update, and delete operations in real time, allowing near-zero downtime cutover. In practice, you must ensure the source MongoDB has an adequate oplog size (e.g., at least 24 hours of changes) to avoid data loss during the CDC phase.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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 ongoing replication from MongoDB to DocumentDB — AWS DMS with ongoing replication (change data capture) allows you to perform a full load of the existing 500 GB MongoDB data into DocumentDB while continuously replicating new changes from the source. This minimizes application downtime because you can cut over to DocumentDB only after the target is fully synchronized, rather than taking the source offline for the entire migration duration.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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