DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. 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 is migrating a 500 GB MySQL database from on-premises to Amazon RDS for MySQL. The migration must have minimal downtime and support ongoing replication. Which AWS service should be used?
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 a full load and ongoing replication from a change data capture source.
AWS DMS is the correct choice because it supports both a full load of the 500 GB database and ongoing replication using change data capture (CDC) from the on-premises MySQL source. This enables minimal downtime by keeping the target RDS instance synchronized during the migration window, and it handles schema conversion automatically for MySQL-to-MySQL migrations without needing a separate tool.
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.
✗
Use mysqldump to export the database and import to RDS during a maintenance window.
Why it's wrong here
mysqldump requires downtime and does not support ongoing replication.
✗
Use AWS Schema Conversion Tool (SCT) to convert the schema and migrate data.
Why it's wrong here
SCT converts schemas but does not migrate data with ongoing replication.
✗
Take a physical backup, copy it to Amazon S3, and restore to RDS.
Why it's wrong here
This is a one-time restore, not supporting ongoing replication.
✓
Use AWS Database Migration Service (DMS) with a full load and ongoing replication from a change data capture source.
Why this is correct
DMS supports full load plus CDC for minimal downtime migrations.
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 assume a simple backup-and-restore or logical dump is sufficient for minimal downtime, but they overlook the requirement for ongoing replication, which only DMS with CDC can provide without disrupting the source database.
Detailed technical explanation
How to think about this question
Under the hood, AWS DMS uses a replication instance that connects to the source MySQL binary logs (binlog) for CDC, capturing insert, update, and delete operations in near real-time while the full load runs in parallel using multiple threads to maximize throughput. In a real-world scenario, if the source database has a high write volume, DMS can be configured with task settings like 'ParallelApplyBufferSize' to handle large transactions without falling behind, ensuring the target remains consistent during the cutover.
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.
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS Database Migration Service (DMS) with a full load and ongoing replication from a change data capture source. — AWS DMS is the correct choice because it supports both a full load of the 500 GB database and ongoing replication using change data capture (CDC) from the on-premises MySQL source. This enables minimal downtime by keeping the target RDS instance synchronized during the migration window, and it handles schema conversion automatically for MySQL-to-MySQL migrations without needing a separate tool.
What should I do if I get this DBS-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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Question Discussion
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