DBS-C01 Deployment and Migration Practice Question
A company is migrating an on-premises MongoDB database to Amazon DocumentDB. They need to ensure that the migration is completed with minimal downtime and that data remains consistent. Which tool should they use?
⚠ Common exam trap
A common mix-up: candidates confuse MongoDB Atlas Live Migration (which is specific to Atlas) with a general-purpose migration tool, or assume that offline tools like mongoexport are sufficient for minimal downtime scenarios.
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 MongoDB as source and DocumentDB as target
AWS DMS supports continuous change data capture (CDC) from MongoDB to Amazon DocumentDB, enabling near-zero downtime migration by replicating ongoing changes after the initial full load. This ensures data consistency without requiring application downtime, unlike batch export/import methods.
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 AWS DMS with MongoDB as source and DocumentDB as target
Why this is correct
DMS supports continuous replication for MongoDB.
- ✗
Use mongoexport and mongoimport
Why it's wrong here
These tools do not support ongoing replication.
- ✗
Export data to Amazon S3 and load into DocumentDB
Why it's wrong here
This does not support ongoing replication.
- ✗
Use MongoDB Atlas Live Migration
Why it's wrong here
MongoDB Atlas is a different service, not for migrating to DocumentDB.
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