Question 799 of 1,663
DBS-C01 Deployment and Migration Practice Question
An administrator needs to migrate an on-premises MongoDB database to Amazon DocumentDB. The migration must have near-zero downtime. Which approach should the administrator use?
⚠ Common exam trap
Many exam-takers choose mongodump/mongorestore (Option C) because it's a familiar MongoDB tool, but they overlook that it requires an offline snapshot, making near-zero downtime impossible.
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 ongoing replication (change data capture) from MongoDB to Amazon DocumentDB, enabling near-zero downtime migrations by keeping the target synchronized with the source until cutover. This approach avoids the downtime required by offline methods like mongodump/mongorestore or bulk data transfer tools.
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 DataSync to transfer the MongoDB data files
Why it's wrong here
DataSync is for file storage, not database replication.
- ✗
Use AWS Glue to extract and load data
Why it's wrong here
Glue is for batch ETL, not real-time replication.
- ✗
Use mongodump to export and mongorestore to import
Why it's wrong here
This requires downtime for consistent backup and restore.
- ✓
Use AWS DMS with MongoDB as source and DocumentDB as target
Why this is correct
DMS supports ongoing replication with change data capture for near-zero downtime.
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Last reviewed: Jul 4, 2026
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