DBS-C01 Deployment and Migration Practice Question
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?
⚠ Common exam trap
Many exam-takers 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.
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
✓
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.
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
AWS Database Migration Service (DMS) performs a full load of the 500 GB database, then uses change data capture (CDC) to capture ongoing MySQL binary log changes, enabling near-zero-downtime replication. This satisfies the stem’s requirement for minimal downtime and continuous synchronisation during migration, as CDC avoids stopping source writes after the initial load.
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This DBS-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 DBS-C01 exam.