DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 migrating a 5 TB MySQL database to Amazon Aurora MySQL. The migration must have zero downtime and the source database is continuously written to. The team plans to use AWS DMS with ongoing replication. However, they notice that the target Aurora instance is not receiving all changes from the source. Which configuration change is most likely required to resolve this?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable binary logging (binlog) on the source MySQL database with row-based logging.
Option D is correct because AWS DMS uses binary logs (binlogs) for ongoing replication from MySQL. If binlogs are not enabled or retained properly, DMS cannot capture changes. Option A is wrong because DMS does not require a VPC endpoint; it uses a replication instance in a VPC. Option B is wrong because DMS requires a target database, but not necessarily a read replica. Option C is wrong because DMS replication tasks have a target table preparation mode, but the issue is about capturing changes, not applying them.
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.
✗
Create an Amazon RDS read replica of the source database and use it as the source endpoint.
Why it's wrong here
DMS can use a read replica as source, but the issue is likely not about source endpoint type.
✗
Set the target table preparation mode to 'Do nothing' in the DMS task.
Why it's wrong here
This affects how target tables are handled before load, not ongoing replication capture.
✓
Enable binary logging (binlog) on the source MySQL database with row-based logging.
Why this is correct
DMS needs binlogs for ongoing replication; if not enabled, it cannot capture changes.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure a VPC endpoint for the DMS replication instance.
Why it's wrong here
VPC endpoints are not required for DMS; DMS connects via the replication instance's network.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Enable binary logging (binlog) on the source MySQL database with row-based logging. — Option D is correct because AWS DMS uses binary logs (binlogs) for ongoing replication from MySQL. If binlogs are not enabled or retained properly, DMS cannot capture changes. Option A is wrong because DMS does not require a VPC endpoint; it uses a replication instance in a VPC. Option B is wrong because DMS requires a target database, but not necessarily a read replica. Option C is wrong because DMS replication tasks have a target table preparation mode, but the issue is about capturing changes, not applying them.
What should I do if I get this DBS-C01 question wrong?
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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