DBS-C01 Workload-Specific Database Design Practice Question
A company is migrating an on-premises MongoDB database to AWS. Which AWS database service is most compatible and requires minimal application changes?
⚠ Common exam trap
Test-takers frequently assume DynamoDB is a suitable document database for MongoDB migration because both are NoSQL, overlooking the critical fact that DynamoDB uses a completely different API and data model, which would require a full application rewrite rather than minimal changes.
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
✓
Amazon DocumentDB (with MongoDB compatibility).
Amazon DocumentDB (with MongoDB compatibility) is the most compatible AWS database service for migrating an on-premises MongoDB database because it is purpose-built to emulate the MongoDB wire protocol and data model, allowing existing MongoDB drivers and tools to connect with minimal or no application code changes. This makes it the ideal choice for a lift-and-shift migration that preserves the document-oriented structure and query patterns of MongoDB.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon DynamoDB.
Why it's wrong here
Different API and data model.
- ✓
Amazon DocumentDB (with MongoDB compatibility).
Why this is correct
MongoDB-compatible document database.
- ✗
Amazon Neptune.
Why it's wrong here
Graph database, not document.
- ✗
Amazon RDS for MySQL.
Why it's wrong here
Relational, not document.
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