DBS-C01 Deployment and Migration Practice Question
A company is migrating a 5 TB MySQL database to Amazon RDS for MySQL. They need to minimize downtime. Which approach should they use?
⚠ Common exam trap
A common mix-up: candidates choose mysqldump (Option B) because it is familiar, but they overlook its inability to handle CDC and the impracticality of exporting 5 TB with minimal downtime.
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 DMS with full load and change data capture (CDC)
AWS DMS with full load and change data capture (CDC) minimizes downtime by performing an initial full load of the 5 TB database while continuously replicating ongoing changes from the source. Once the full load completes and the target is nearly synchronized, you can cut over with minimal downtime, typically seconds to minutes. This approach is specifically designed for large-scale migrations with low downtime requirements.
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 Percona XtraBackup to take a backup and restore to RDS
Why it's wrong here
Requires downtime for restore.
- ✗
Use mysqldump to export and import data
Why it's wrong here
Causes downtime during export/import.
- ✓
Use AWS DMS with full load and change data capture (CDC)
Why this is correct
Minimizes downtime with CDC.
- ✗
Use AWS DataSync to copy database files
Why it's wrong here
Not suitable for live migration.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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