DEA-C01 Data Operations and Support Practice Question
A data engineer uses AWS Database Migration Service (DMS) to migrate an on-premises Oracle database to Amazon Aurora MySQL. The migration is successful, but the engineer notices that the target Aurora cluster has a higher CPU utilization than expected during the full load phase. What is the MOST likely cause?
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
✓
The DMS task is configured to use multiple parallel threads to load data, overwhelming the target instance.
During full load, DMS uses multiple parallel threads (by default up to 4 or more) to maximize throughput, which can overwhelm the target Aurora cluster's CPU. Option A is incorrect: 'Full LOB mode' affects how large objects are handled and may increase latency, but it is not the primary cause of high CPU utilization. Option B is incorrect: DMS performs data validation after the full load phase, not during it. Option C is incorrect: DMS reads from the source (on-premises Oracle), not from an Aurora read replica; moreover, read replicas are not used for writing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The DMS task has LOB mode set to 'Full LOB mode', causing additional processing.
Why it's wrong here
LOB mode affects how large objects are handled, not CPU load.
- ✗
DMS is performing data validation during the full load phase.
Why it's wrong here
Validation is typically done after full load.
- ✗
DMS is reading from an Amazon Aurora read replica instead of the primary instance.
Why it's wrong here
DMS reads from the source, not from a read replica of the target.
- ✓
The DMS task is configured to use multiple parallel threads to load data, overwhelming the target instance.
Why this is correct
Parallel threads increase throughput but also increase CPU usage.
Go deeper
Related to this question
About these practice questions
This DEA-C01 question is part of Courseiva's 1,711-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
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.