| Service | Base Cost Model | Typical Monthly Cost (100GB, moderate I/O) | |---------|----------------|----------------------------------------------| | (r6g.large, Single-AZ) | Compute + Storage + I/O | ~$180-250 | | MongoDB Atlas (M30, 4GB RAM) | All-inclusive (instance + storage + I/O) | ~$250-350 (AWS us-east-1) | | Amazon DynamoDB (provisioned) | Write/read units + storage | Highly variable, but often cheaper for key-value but not for complex queries |
| Cost Driver | Low Cost (dev/test) | Moderate (production) | High (heavy production) | |-------------|--------------------|------------------------|--------------------------| | Instance | db.t3.medium (Single-AZ) | db.r6g.large (Single-AZ) | db.r6g.4xlarge (Multi-AZ) | | Monthly compute | ~$67 | ~$118 | ~$1,890 | | Storage (500 GB) | $50 | $50 | $50 | | I/O (millions/month) | 50 ($10) | 500 ($100) | 5,000 ($1,000) | | | ~$127 | ~$268 | ~$2,940 | amazon documentdb price
| Model | Best for | Discount vs On-Demand | Commitment | |-------|----------|----------------------|-------------| | | Dev/test, spiky workloads | 0% | None | | 1-year Reserved Instance | Steady production | ~40-45% | 1 year | | 3-year Reserved Instance | Critical production | ~55-60% | 3 years | | Savings Plan (EC2/Compute) | Mixed compute workloads | Similar to RIs | 1 or 3 years | | Service | Base Cost Model | Typical
All prices are hourly and approximate as of 2026. amazon documentdb price