- A
AWS DataSync
Why wrong: DataSync transfers files between storage systems (NFS, SMB, S3, EFS) — it doesn't replicate relational database transactions.
- B
AWS Database Migration Service (DMS)
DMS handles both full-load migration and continuous change data capture (CDC) replication between heterogeneous databases, supporting live cutover with minimal downtime.
- C
AWS Snowball
Why wrong: Snowball is for physical bulk data transfer, not real-time database replication.
- D
Amazon Kinesis Data Streams
Why wrong: Kinesis handles streaming data but doesn't understand database transaction logs or heterogeneous database schemas.
Question 69 of 1,024
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. 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 company needs to synchronize data in real time between its on-premises Oracle database and an Amazon RDS MySQL instance during a migration. Which AWS service handles ongoing data replication between heterogeneous databases?
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
✓
AWS Database Migration Service (DMS)
AWS Database Migration Service (DMS) is the correct choice because it supports ongoing replication (change data capture, CDC) from an on-premises Oracle database to an Amazon RDS MySQL instance, even when the source and target are heterogeneous database engines. DMS uses a replication instance to read the source database's transaction logs and apply changes in near real time to the target, making it ideal for continuous synchronization during a migration.
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 transfers files between storage systems (NFS, SMB, S3, EFS) — it doesn't replicate relational database transactions.
- ✓
AWS Database Migration Service (DMS)
Why this is correct
DMS handles both full-load migration and continuous change data capture (CDC) replication between heterogeneous databases, supporting live cutover with minimal downtime.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Snowball
Why it's wrong here
Snowball is for physical bulk data transfer, not real-time database replication.
- ✗
Amazon Kinesis Data Streams
Why it's wrong here
Kinesis handles streaming data but doesn't understand database transaction logs or heterogeneous database schemas.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse AWS DataSync (file sync) or Kinesis (streaming) with database replication, but only DMS provides native support for ongoing, heterogeneous database replication using CDC.
Detailed technical explanation
How to think about this question
DMS implements CDC by connecting to the source Oracle database as a logical replica and reading its redo logs (using Oracle LogMiner or binary reader), then transforming the captured changes to the target MySQL schema using built-in conversion rules. A subtle behavior is that DMS requires the source database to have supplemental logging enabled for all columns to capture complete row changes; without it, ongoing replication may miss updates or fail to apply them correctly. In a real-world migration, you might use DMS in full-load-plus-CDC mode to first copy existing data, then continuously sync changes until you cut over to the target.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and Services — 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) — AWS Database Migration Service (DMS) is the correct choice because it supports ongoing replication (change data capture, CDC) from an on-premises Oracle database to an Amazon RDS MySQL instance, even when the source and target are heterogeneous database engines. DMS uses a replication instance to read the source database's transaction logs and apply changes in near real time to the target, making it ideal for continuous synchronization during a migration.
What should I do if I get this CLF-C02 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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Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 11, 2026
This CLF-C02 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 CLF-C02 exam.
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