DBS-C01 Deployment and Migration Practice Question
A company wants to migrate an on-premises MongoDB database to Amazon DocumentDB. The migration must be performed with minimal downtime and should support live data synchronization. Which AWS service should be used?
⚠ Common exam trap
A common mix-up: candidates confuse AWS DMS's ongoing replication with batch-oriented services like Glue or Data Pipeline, assuming any 'sync' tool works, but only DMS provides native CDC from MongoDB's oplog for live migration to DocumentDB.
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 ongoing replication.
AWS Database Migration Service (DMS) with ongoing replication is the correct choice because it supports continuous change data capture (CDC) from a source MongoDB database to Amazon DocumentDB, enabling live data synchronization with minimal downtime. DMS can perform a full load followed by ongoing replication using the MongoDB oplog to capture and apply changes in near real-time, which meets the requirement for minimal downtime during migration.
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 Glue with streaming ETL jobs.
Why it's wrong here
Glue streaming is for near real-time ETL but does not directly support MongoDB to DocumentDB migration.
- ✗
AWS Data Pipeline to schedule periodic data loads.
Why it's wrong here
Data Pipeline performs batch jobs, not real-time replication.
- ✗
AWS S3 with AWS Lambda functions to sync data.
Why it's wrong here
This approach is complex and does not provide built-in replication for database migration.
- ✓
AWS Database Migration Service (DMS) with ongoing replication.
Why this is correct
DMS can connect to MongoDB as source and DocumentDB as target with change data capture for minimal downtime.
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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.