The answer is AWS Database Migration Service (DMS) with ongoing replication enabled. This is correct because DMS uses change data capture (CDC) to read the source RDS MySQL binary logs (binlog) in near real-time, capturing inserts, updates, and deletes with minimal overhead on the source instance. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of managed replication strategies versus native MySQL replication, which RDS restricts for external targets. A common trap is choosing Kinesis Data Streams or DynamoDB Streams, but those require complex custom pipelines or are simply not designed for RDS MySQL change capture. Remember that DMS with ongoing replication is the only fully managed, low-impact service that directly reads the binlog to replicate data changes to a separate reporting database. Memory tip: think “DMS = Database Migration Service, but with CDC it’s also your Change Data Capture workhorse for RDS MySQL.”
DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. 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 runs a MySQL database on Amazon RDS and wants to capture data changes to replicate to a separate reporting database. Which AWS service should be used to capture these changes with minimal impact on the source database?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS Database Migration Service (DMS) with ongoing replication enabled.
Option D is correct because AWS DMS with ongoing replication (change data capture) captures changes from the source RDS MySQL binlog with minimal impact. Option A is wrong because RDS does not support native MySQL replication to external targets easily. Option B is wrong because DynamoDB Streams is for DynamoDB, not RDS. Option C is wrong because Kinesis Data Streams is not designed to directly capture RDS changes; requires additional configuration.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use Amazon DynamoDB Streams to capture changes from the RDS instance.
Why it's wrong here
DynamoDB Streams only works with DynamoDB.
✗
Enable MySQL native replication from the RDS instance to the reporting database.
Why it's wrong here
RDS does not facilitate native replication to external MySQL instances.
✗
Use Amazon Kinesis Data Streams with a custom application to poll the binlog.
Why it's wrong here
Possible but not a managed service; more complex.
✓
Use AWS Database Migration Service (DMS) with ongoing replication enabled.
Why this is correct
DMS can capture changes from RDS MySQL binlog with minimal impact.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. 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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use AWS Database Migration Service (DMS) with ongoing replication enabled. — Option D is correct because AWS DMS with ongoing replication (change data capture) captures changes from the source RDS MySQL binlog with minimal impact. Option A is wrong because RDS does not support native MySQL replication to external targets easily. Option B is wrong because DynamoDB Streams is for DynamoDB, not RDS. Option C is wrong because Kinesis Data Streams is not designed to directly capture RDS changes; requires additional configuration.
What should I do if I get this DBS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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