The answer is to increase the size of the DMS replication instance. This is correct because a larger instance provides additional CPU and memory, directly addressing DMS high latency by enabling the instance to process incoming change data capture (CDC) events more quickly and handle larger transaction volumes without backlog. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of DMS resource scaling as a primary tuning lever for ongoing replication performance, often appearing as a distractor against options like modifying target storage or source log settings. A common trap is assuming you must change the target database or source configuration, but the replication instance itself is the bottleneck when latency spikes. Memory tip: think of the DMS instance as a funnel—widening it (increasing size) lets changes flow faster, reducing the latency backlog.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 AWS DMS to migrate data from an on-premises Oracle database to Amazon Aurora MySQL. The migration is successful, but the ongoing replication task is experiencing high latency. Which configuration change is most likely to reduce latency?
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
✓
Increase the size of the DMS replication instance.
Option B is correct because increasing the DMS replication instance size provides more CPU and memory, which can process changes faster. Option A (S3 as target) is not applicable as the target is Aurora. Option C (CDC from binary logs) is for MySQL source. Option D (decrease batch size) would likely increase latency.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 size of the DMS replication instance.
Why this is correct
A larger instance provides more resources to process change data capture (CDC) faster.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
Decrease the task's batch size and batch apply timeout.
Why it's wrong here
Smaller batches mean more frequent commits, which can increase overhead and latency.
✗
Change the target endpoint to Amazon S3.
Why it's wrong here
The target is Aurora MySQL, not S3; changing target would break the migration.
✗
Enable Change Data Capture (CDC) from binary logs.
Why it's wrong here
Binary logs are for MySQL; Oracle uses redo logs. This would not apply.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
Data Operations and Support — This question tests Data Operations and Support — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Increase the size of the DMS replication instance. — Option B is correct because increasing the DMS replication instance size provides more CPU and memory, which can process changes faster. Option A (S3 as target) is not applicable as the target is Aurora. Option C (CDC from binary logs) is for MySQL source. Option D (decrease batch size) would likely increase latency.
What should I do if I get this DEA-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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Question Discussion
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