DynamoDB Reserved Capacity Opportunity
CostLens surfaces reserved-capacity purchase recommendations for predictable DynamoDB provisioned capacity via AWS Cost Explorer.
Reserved capacity discounts steady provisioned read/write throughput versus on-demand provisioned rates. CostLens reads AWS Cost Explorer for a sized recommendation when one is available.
How it works
CostLens queries Cost Explorer
Calls ce:GetReservationPurchaseRecommendation for Amazon DynamoDB (runs once — Cost Explorer is global).
Parses any recommendation
Extracts term, payment option, recommended quantity, estimated monthly savings, and break-even months.
Filters to meaningful spend
Only surfaces recommendations where covered on-demand spend exceeds $100/month.
What to do
- Open the recommendation to review term, break-even, and annual savings.
- Confirm the table's provisioned throughput is steady before committing.
- Purchase reserved capacity in the AWS console. This check is advisory.
AWS availability
AWS Cost Explorer does not currently return reserved-capacity purchase recommendations for DynamoDB in all accounts. When AWS provides no recommendation, this check produces no findings — it never shows a guess.
Required IAM permissions
Read-only — covered by the CostLens ReadOnlyAccess policy from AWS Accounts:
ce:GetReservationPurchaseRecommendation
Limitations
- Advisory only — reserved-capacity purchases are customer-initiated in the AWS console.
- Depends on AWS Cost Explorer support for DynamoDB recommendations in your account.