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Cost Optimization

Database Savings Plans vs RDS Reserved Instances: Which Commitment to Buy in 2026

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October 25, 2026

6 min read

Database Savings Plans cover Aurora, RDS, DynamoDB, ElastiCache and more with one hourly commitment, up to 35% off, on a one-year term with no upfront payment. RIs still discount more for workloads that will not change. How to choose, and how to avoid buying both for the same database.

Database Savings Plans
Reserved Instances
Aurora
RDS
DynamoDB
FinOps

Until December 2025 the only way to discount a database on AWS was a Reserved Instance: a fixed engine, instance family and Region for one or three years. Database Savings Plans replaced that with an hourly spend commitment that applies across engines, families, sizes, deployment options and Regions.

What the plan covers

  • Aurora (provisioned and Serverless), RDS, DynamoDB, ElastiCache for Valkey, DocumentDB, Neptune, Keyspaces, Timestream, DMS and OpenSearch Service.

  • Up to 35% off, on a one-year term with no upfront payment.

  • Serverless and provisioned usage both count, which is new: Aurora Serverless had no commitment discount before.

  • For SQL Server, only the instance price is discounted. Windows and SQL Server licence charges stay at on-demand rates.

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Plans vs RIs

Database Savings Plans

RDS Reserved Instances

Commitment

$ per hour of spend

A specific engine, family and Region

Term

One year

One or three years

Upfront

None

All, partial or none

Flexibility

Any supported engine, family, size or Region; RDS to Aurora to DynamoDB

Size flexibility within a family for some engines

Depth of discount

Up to 35%

Can be deeper for three-year terms

Combining

Cannot be combined with RDS RIs or DynamoDB reserved capacity on the same usage

Same

How we decide

  • Buy a Savings Plan when the database estate is changing: a migration from RDS to Aurora, a move to Graviton, a Region expansion, or a plan to try Aurora Serverless. The commitment survives all of them.

  • Keep RIs for a database you are certain will run on the same family in the same Region for three years. That certainty is what the deeper discount pays for.

  • Commit to your floor, not your average. Size the plan to the lowest hourly database spend of the last few months, and let on-demand cover the rest.

  • If you hold RIs today, let them expire and replace them with plan coverage rather than buying both. Usage covered by an RI is not discounted again by the plan.

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As of October 25, 2026. Provided as is, for general information, and accurate to the best of our knowledge on the date shown. Not legal, compliance, tax, financial or other professional advice. Prices, limits and vendor services change; check current vendor documentation before relying on anything here. Terms of use.