The correct three actions are to enable BatchApply, tune the DMS task to use a larger memory limit, and adjust the transaction size on the source. BatchApply reduces apply time by grouping changes into batches, which lowers the overhead of individual commits and prevents the task from falling behind during large transactions. Tuning the transaction size, such as splitting large source transactions into smaller chunks, directly reduces memory pressure on the DMS cache, while increasing the task’s memory limit ensures the cache can hold more change data without spilling to disk. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of how DMS handles high-volume transactional workloads and the trade-offs between performance and resource consumption. A common trap is assuming that adding parallel threads on the source will help—this actually increases CPU load and can worsen latency. Remember the mnemonic “BMT” for BatchApply, Memory, and Transaction size to recall the three tuning levers for large transactions.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. 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 uses Amazon RDS for MySQL as a source for AWS DMS. The replication tasks are failing due to large transactions on the source. The team wants to reduce the impact of large transactions on DMS. Which THREE actions should the team take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the size of the source RDS instance and enable binary logging with ROW format.
Options A, C, and D are correct. BatchApply reduces apply time, tuning transaction size reduces memory pressure, and increasing the TLog size helps capture changes. Option B is wrong because parallel threads on source may increase CPU. Option E is wrong because switching to full load only is not a replication solution.
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.
✗
Increase the number of parallel threads on the source.
Why it's wrong here
More threads increase source load.
✓
Increase the size of the source RDS instance and enable binary logging with ROW format.
Why this is correct
Larger instance and proper logging help DMS capture changes.
Related concept
Read the scenario before looking for a memorised answer.
✓
Enable BatchApply in the DMS task settings.
Why this is correct
BatchApply reduces the number of apply statements.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the 'full load only' migration type.
Why it's wrong here
Full load only does not capture ongoing changes.
✓
Tune the DMS task to use a larger memory limit and adjust the transaction size.
Why this is correct
Helps handle large transactions.
Related concept
Read the scenario before looking for a memorised answer.
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 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 DEA-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.
Data Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Increase the size of the source RDS instance and enable binary logging with ROW format. — Options A, C, and D are correct. BatchApply reduces apply time, tuning transaction size reduces memory pressure, and increasing the TLog size helps capture changes. Option B is wrong because parallel threads on source may increase CPU. Option E is wrong because switching to full load only is not a replication solution.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-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.
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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