DEA-C01 Data Operations and Support Practice Question
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?
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
✓
Increase the size of the DMS replication instance.
Increasing the size of the DMS replication instance provides more CPU and memory, which can process and apply changes faster, thereby reducing latency in ongoing replication. Option B is incorrect because decreasing the batch size and batch apply timeout would likely increase latency by reducing the efficiency of batch writes. Option C is incorrect because changing the target endpoint to Amazon S3 is not relevant; the target is Aurora MySQL, and migrating to S3 would not resolve latency issues for the current setup. Option D is incorrect because enabling CDC from binary logs is not applicable; the source is Oracle, which uses redo logs, not binary logs. Additionally, CDC is already used in ongoing replication from Oracle.
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.
- ✗
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.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.