Amazon DocumentDB
MongoDB-compatible document database
A managed document (JSON) database compatible with the MongoDB API; it separates compute and storage like Aurora, replicates data 6 ways across 3 AZs, and makes adding read replicas easy.
- Cost$$ Medium
- Difficulty●●●●●
- Costs money when idle?Yes
- Managed by AWS
- In examsCLF · SAA
Think of it asLike a filing cabinet where each drawer is a free-form folder of documents that don't have to follow the same template.
When to use it
✓ Use it when
Applications already using MongoDB that want to move to AWS without operating the cluster themselves.
✗ Avoid it when
Simple key-value queries at large scale, serverless → DynamoDB; need every latest MongoDB feature → MongoDB Atlas on Marketplace.
Common uses
- Product catalogs with varying attributes
- User profiles, CMS content
- Moving self-managed MongoDB to a managed service
What does it cost?
- Pricing model: Charged per instance hour, GB stored, I/O (or the I/O-Optimized option) and backups beyond the free allowance.
Related services
SAA-C03 study guide
DocumentDB is covered in these study modules: