DBS-C01 Deployment and Migration Practice Question
A company wants to migrate an on-premises MySQL database to Amazon RDS for MySQL with minimal downtime. They plan to use AWS DMS. Which source database configuration is required to enable ongoing replication (CDC)?
⚠ Common exam trap
Test-takers frequently confuse MySQL's binary log with other logs (slow query log, query cache) or assume that auto-increment settings are required for replication, when in fact only binlog enables the change stream DMS needs for CDC.
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 database
AWS DMS requires binary logging (binlog) enabled on the source MySQL database to capture ongoing changes for continuous replication (CDC). The binlog records all data modifications (INSERT, UPDATE, DELETE) in a sequential log, which DMS reads to apply those changes to the target RDS instance with minimal downtime. Without binlog enabled, DMS can only perform a full load migration and cannot support ongoing replication.
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 database
Why this is correct
Binlog captures changes for CDC.
- ✗
Set auto_increment_increment to 1
Why it's wrong here
This is for replication conflict avoidance, not required for CDC.
- ✗
Enable the slow query log
Why it's wrong here
Slow query log is for troubleshooting, not CDC.
- ✗
Enable the query cache
Why it's wrong here
Query cache is for performance, not CDC.
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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.