DBS-C01 Workload-Specific Database Design Practice Question
A company is running a MongoDB workload on-premises and wants to migrate to AWS with minimal operational overhead. The application uses MongoDB-specific features like aggregation pipelines. Which service is best?
⚠ Common exam trap
Many exam-takers choose Amazon DynamoDB because it is a NoSQL database, but they overlook that DynamoDB lacks MongoDB wire protocol compatibility and aggregation pipeline support, forcing a complete application rewrite.
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
Amazon DocumentDB is the correct choice because it is a fully managed, MongoDB-compatible document database that supports MongoDB-specific features like aggregation pipelines, indexes, and queries. It minimizes operational overhead by handling hardware provisioning, patching, backups, and replication, making it ideal for migrating an on-premises MongoDB workload to AWS without significant application changes.
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
DynamoDB is not compatible with MongoDB APIs.
- ✓
Amazon DocumentDB
Why this is correct
DocumentDB is MongoDB-compatible and fully managed, reducing operational overhead.
- ✗
Amazon RDS for PostgreSQL
Why it's wrong here
RDS for PostgreSQL is relational and does not support MongoDB features.
- ✗
Amazon Elasticsearch Service
Why it's wrong here
Elasticsearch is a search engine, not a document database.
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