DBS-C01 Deployment and Migration Practice Question
A company is migrating a 2 TB PostgreSQL database from on-premises to Amazon RDS for PostgreSQL. The migration must have minimal downtime and support ongoing replication. Which AWS service should be used for the migration?
⚠ Common exam trap
The DBS-C01 exam often tests the misconception that AWS Data Migration Service (a non-existent service) combined with AWS Glue is a valid migration path, when in fact the correct service is AWS Database Migration Service (DMS) with CDC, and Glue is unrelated to live database replication.
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
✓
AWS Database Migration Service (DMS) with change data capture
AWS Database Migration Service (DMS) with change data capture (CDC) is the correct choice because it supports ongoing replication from the source PostgreSQL database to Amazon RDS for PostgreSQL with minimal downtime. DMS performs a full load of the 2 TB database and then continuously applies changes using PostgreSQL's logical replication slots (via the pglogical extension or native WAL-based CDC), ensuring the target remains synchronized during the migration cutover.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AWS S3 Transfer Acceleration for direct database export
Why it's wrong here
S3 is used for bulk data storage, not live replication.
- ✗
AWS Data Migration Service with AWS Glue
Why it's wrong here
AWS Glue is for ETL, not ongoing replication from on-premises.
- ✗
AWS Snowball Edge for offline data transfer
Why it's wrong here
Snowball is for offline bulk transfer, not minimal downtime replication.
- ✓
AWS Database Migration Service (DMS) with change data capture
Why this is correct
AWS DMS supports ongoing replication with CDC for minimal downtime.
Go deeper
Related to this question
About these practice questions
One of 1,663 original DBS-C01 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
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.