DBS-C01 Deployment and Migration Practice Question
A developer needs to migrate a 500 GB MongoDB database to Amazon DocumentDB. Which approach will minimize application downtime?
⚠ Common exam trap
Watch out — candidates often choose Option B (export/import) because it seems straightforward, but they overlook the need for ongoing replication to minimize downtime, which is the key requirement in the question.
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 ongoing replication from MongoDB to DocumentDB
AWS DMS with ongoing replication (change data capture) allows you to perform a full load of the existing 500 GB MongoDB data into DocumentDB while continuously replicating new changes from the source. This minimizes application downtime because you can cut over to DocumentDB only after the target is fully synchronized, rather than taking the source offline for the entire migration duration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Write a custom script to migrate data in batches
Why it's wrong here
Complex and error-prone.
- ✗
Export data from MongoDB, upload to S3, and import into DocumentDB
Why it's wrong here
Significant downtime.
- ✓
Use AWS DMS with ongoing replication from MongoDB to DocumentDB
Why this is correct
Minimal downtime with live migration.
- ✗
Use AWS DataSync to transfer data files
Why it's wrong here
Not suitable for database migration.
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Variation 1. Which TWO AWS services can be used to migrate a MongoDB database to Amazon DocumentDB? (Choose 2.)
easy- A.AWS DataSync
- ✓ B.AWS Database Migration Service (AWS DMS)
- C.Amazon S3
- ✓ D.MongoDB native tools (mongodump and mongorestore)
- E.Amazon Kinesis Data Streams
Why B: AWS Database Migration Service (AWS DMS) supports MongoDB as a source and Amazon DocumentDB as a target, enabling continuous replication with change data capture (CDC) for minimal downtime. MongoDB native tools (mongodump and mongorestore) are also valid for offline, one-time migrations by exporting the database as BSON files and importing them directly into DocumentDB.
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.