DBS-C01 Workload-Specific Database Design Practice Question
A company runs a MongoDB workload on Amazon EC2 and wants to migrate to Amazon DocumentDB. The database has a total size of 2 TB and experiences 10,000 writes per second during peak. Which migration strategy minimizes downtime?
⚠ Common exam trap
Watch out — candidates often assume a simple export/import (mongodump/mongorestore) is sufficient, but they overlook the requirement for minimal downtime with a high-write workload, where only a CDC-capable tool like DMS can keep the target synchronized during migration.
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 continuous replication.
AWS DMS with continuous replication (change data capture) is the correct strategy because it allows you to keep the source MongoDB and target DocumentDB synchronized in near-real time, minimizing downtime to a brief cutover window. For a 2 TB database with 10,000 writes per second, a full export/import would take hours and require significant downtime, while DMS handles the initial full load and then continuously applies ongoing changes until you switch over.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Export data using mongodump and import with mongorestore.
Why it's wrong here
Requires application downtime.
- ✗
Use AWS Glue to stream data to DocumentDB.
Why it's wrong here
Glue is not designed for real-time replication.
- ✓
Use AWS DMS with continuous replication.
Why this is correct
DMS supports live migration with minimal downtime.
- ✗
Copy data files to Amazon S3 and load into DocumentDB.
Why it's wrong here
No direct load from S3.
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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.