The answer is AWS Database Migration Service (DMS) with change data capture (CDC). This combination is correct because CDC captures only incremental changes—inserts, updates, and deletes—after an initial full load, which minimizes data transfer over limited bandwidth while preserving transactional integrity and data consistency. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of how to schedule Oracle to S3 replication using AWS DMS under bandwidth constraints, often appearing as a trap where candidates mistakenly choose AWS DataSync or AWS Glue. DataSync is optimized for large, one-time transfers, not ongoing hourly replication, and Glue lacks native CDC for Oracle. The key memory tip is “CDC for continuous, low-bandwidth change capture”—think of CDC as the “change detective” that only sends what’s new, keeping your pipeline lean and consistent.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 data engineer is tasked with setting up a data pipeline that moves data from an on-premises Oracle database to Amazon S3 every hour. The network bandwidth is limited, and the engineer needs to ensure data consistency. Which AWS service should the engineer use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Database Migration Service (DMS) with change data capture (CDC).
AWS DMS with CDC is the correct choice because it can continuously replicate ongoing changes from an on-premises Oracle database to Amazon S3 while ensuring data consistency. CDC captures only the incremental changes (inserts, updates, deletes) after an initial full load, minimizing the data transferred over limited bandwidth and maintaining transactional integrity.
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.
✗
AWS DataSync.
Why it's wrong here
DataSync is designed for file shares, not databases.
✗
Amazon Kinesis Data Firehose.
Why it's wrong here
Firehose is for streaming data, not for batch replication from a database.
✗
S3 Transfer Acceleration.
Why it's wrong here
Transfer Acceleration speeds up uploads but does not provide database replication or consistency.
✓
AWS Database Migration Service (DMS) with change data capture (CDC).
Why this is correct
DMS supports continuous replication and ensures data consistency via CDC.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS DataSync (a file-transfer service) with database replication, or assume S3 Transfer Acceleration can solve bandwidth issues without addressing the need for change data capture and consistency from a live database.
Detailed technical explanation
How to think about this question
AWS DMS uses a replication instance to connect to the Oracle source via Oracle LogMiner or binary reader to read redo logs for CDC, ensuring minimal impact on the source database. The task can be configured with 'Full Load + CDC' to first copy existing data and then continuously apply changes, with built-in validation checks to verify row counts and checksums for consistency. In limited bandwidth scenarios, DMS can also compress data in transit and use multiple parallel threads to optimize throughput.
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.
TExam Day Tips
→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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: AWS Database Migration Service (DMS) with change data capture (CDC). — AWS DMS with CDC is the correct choice because it can continuously replicate ongoing changes from an on-premises Oracle database to Amazon S3 while ensuring data consistency. CDC captures only the incremental changes (inserts, updates, deletes) after an initial full load, minimizing the data transferred over limited bandwidth and maintaining transactional integrity.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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