DBS-C01 Deployment and Migration Practice Question
A company is migrating a MySQL database to Amazon RDS for MySQL. They want to use AWS DMS for continuous replication. Which TWO prerequisites must be met before starting the migration?
⚠ Common exam trap
Test-takers frequently assume the source must be read-only during migration (Option C), but DMS supports live migration with zero downtime by using CDC, so read-only mode is only needed for certain homogenous migrations or final cutover phases, not as a general prerequisite.
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
✓
Enable binary logging (binlog) on the source MySQL database.
AWS DMS uses MySQL's binary log (binlog) to capture ongoing changes for continuous replication (CDC). Enabling binlog on the source database is mandatory because DMS reads the binlog to identify insert, update, and delete operations after the initial full load. Without binlog enabled, DMS cannot perform change data capture and the migration will be limited to a one-time full load only.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable binary logging (binlog) on the source MySQL database.
Why this is correct
Binary logging is necessary for DMS to capture ongoing changes.
- ✓
Ensure the DMS replication instance has network connectivity to the source and target databases.
Why this is correct
DMS needs network access to both databases for replication.
- ✗
Set the source database to read-only mode during migration.
Why it's wrong here
DMS can replicate while the source is operational; read-only is not required.
- ✗
Place the source database in a VPC.
Why it's wrong here
The source database can be on-premises or in a VPC; VPC is not a prerequisite.
- ✗
Create an S3 bucket to store the migration logs.
Why it's wrong here
S3 is not a prerequisite for DMS; logs can be stored in CloudWatch.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.