DEA-C01 Data Store Management Practice Question
A company is migrating an on-premises MongoDB database to Amazon DocumentDB. The migration must have minimal downtime. Which service should be used to perform the migration?
⚠ Common exam trap
A common mix-up: candidates confuse AWS DMS with AWS DataSync or AWS Glue, assuming any 'migration' or 'data transfer' service can handle live database replication, but only DMS provides the necessary CDC engine for heterogeneous database migrations with minimal downtime.
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)
AWS Database Migration Service (DMS) is the correct choice because it supports continuous replication from MongoDB to Amazon DocumentDB using change data capture (CDC), enabling near-zero downtime migrations. DMS can perform a full load of existing data and then apply ongoing changes from the source MongoDB oplog, keeping the target DocumentDB synchronized until the 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 Glue
Why it's wrong here
Glue is an ETL service, not optimized for live database migration.
- ✗
AWS DataSync
Why it's wrong here
DataSync is for moving data between on-premises storage and AWS storage services.
- ✓
AWS Database Migration Service (DMS)
Why this is correct
DMS supports MongoDB to DocumentDB migration with minimal downtime using change data capture.
- ✗
Amazon S3 Transfer Acceleration
Why it's wrong here
Amazon S3 Transfer Acceleration speeds up uploads to S3 buckets via optimised network paths, but it cannot connect to or write data into a DocumentDB database, nor does it perform any schema conversion or continuous replication. It is tempting because its name suggests faster data movement, and it would be correct for rapidly transferring large files into an S3 bucket over long distances.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-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 DEA-C01 exam.