The answer is to use AWS DMS with full load and ongoing replication from MongoDB to DocumentDB. This strategy minimizes downtime because after the initial full data load, AWS DMS enables change data capture (CDC), which continuously synchronizes incremental changes from the source MongoDB to the target DocumentDB, allowing you to cut over with only a brief pause. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of near-zero downtime migration patterns for live databases, often appearing as a distractor against options like a simple snapshot restore or a manual export-import, which require extended downtime. A common trap is assuming a one-time full load is sufficient, but the key is the ongoing replication phase that keeps the target current. Memory tip: think "Full load first, then CDC keeps the clock ticking" to remember that ongoing replication is what minimizes the final cutover window.
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 data engineer is migrating an on-premises MongoDB database to Amazon DocumentDB. Which migration strategy minimizes downtime?
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 full load and ongoing replication from MongoDB to DocumentDB.
AWS DMS with full load and ongoing replication (change data capture) minimizes downtime by continuously synchronizing changes from the source MongoDB to the target DocumentDB after the initial full load, allowing a cutover with only a brief pause. This is the only option that supports near-zero downtime migration for live databases.
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.
✗
Take a snapshot of the MongoDB database and restore it to DocumentDB.
Why it's wrong here
Snapshot restore requires downtime for consistency.
✗
Use AWS Database Migration Service (AWS DMS) with full load only.
Why it's wrong here
Full load only does not capture ongoing changes, requiring downtime.
✗
Export data using mongodump and import using mongorestore.
Why it's wrong here
Export/import requires application downtime.
✓
Use AWS DMS with full load and ongoing replication from MongoDB to DocumentDB.
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume any AWS DMS migration automatically minimizes downtime, but only the full load plus ongoing replication (CDC) option achieves near-zero downtime, while full load only still requires a write stop.
Detailed technical explanation
How to think about this question
AWS DMS uses Change Data Capture (CDC) by reading the MongoDB oplog to capture insert, update, and delete operations in near real-time, applying them to DocumentDB. The full load phase creates a consistent snapshot using a checkpoint, then CDC streams changes from that checkpoint onward, enabling a seamless cutover with seconds of downtime. In practice, you must ensure the MongoDB oplog has sufficient retention (e.g., 24 hours) to avoid data loss during the migration.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Data Store Management — This question tests Data Store Management — 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 full load and ongoing replication from MongoDB to DocumentDB. — AWS DMS with full load and ongoing replication (change data capture) minimizes downtime by continuously synchronizing changes from the source MongoDB to the target DocumentDB after the initial full load, allowing a cutover with only a brief pause. This is the only option that supports near-zero downtime migration for live databases.
What should I do if I get this DEA-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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Question Discussion
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