# MemoryDB

## AWS MemoryDB — commitment brief

> **Data sourced**: March 2026. Verify current figures at the [AWS Pricing Calculator](https://calculator.aws/pricing/2/home).

### Coverage summary

Amazon MemoryDB (Valkey- and Redis OSS-compatible durable in-memory database) supports Reserved Nodes (1-yr and 3-yr terms) for all provisioned node types. Reserved Nodes offer up to 55% savings versus on-demand pricing. Reserved Nodes for MemoryDB offer size flexibility within a node family and AWS region — a reservation for any size within a family (e.g., db.r6g) can apply to other sizes in that family, giving operational flexibility as workloads scale. MemoryDB has no Convertible RI equivalent and is not covered by Savings Plans.

**What is covered**: MemoryDB provisioned node compute charges (the per-node-hour cost) for cluster nodes.

**What is not covered**: MemoryDB storage (durable snapshot storage in S3), data transfer between availability zones, CloudWatch metrics, and any cross-region or multi-region replication charges.

### RI types

> Amazon MemoryDB uses **Reserved Nodes** with three payment options: **All Upfront** (maximum discount, up to 55%), **Partial Upfront**, and **No Upfront**. Terms: 1-year and 3-year. Reserved Nodes offer size flexibility within a node family and region — useful for clusters that may scale up or down within the same family during the reservation term.

### Instance / node / tier coverage

| Node Family                          | Reserved Node | 1-yr (All Upfront) | 3-yr (All Upfront) | Notes                                                   |
| ------------------------------------ | ------------- | ------------------ | ------------------ | ------------------------------------------------------- |
| db.r7g (Graviton3, memory optimized) | ✅ Yes         | \~35–42%           | \~50–55%           | Current-gen recommended; size flexibility within family |
| db.r6g (Graviton2, memory optimized) | ✅ Yes         | \~35–42%           | \~50–55%           | Size flexibility within family                          |
| db.t4g (Graviton2, burstable)        | ✅ Yes         | \~35–42%           | \~50–55%           | Dev/test; size flexibility within family                |

## Regional availability

**Commitment scope**: Regional — Reserved Nodes are purchased for a specific AWS region; the reservation applies only to usage in that region.

Available in all commercial AWS regions where MemoryDB is offered. Amazon MemoryDB became available in GovCloud regions in October 2024, expanding its footprint to regulated environments.

**Partition notes**: GovCloud (us-gov-*) regions support MemoryDB and Reserved Nodes for r6g and r7g node types, but the r6gd node type (with data-tiering) is not available in GovCloud. MemoryDB is not available in China (cn-*) regions.

⚠️ Regional and partition availability varies by instance type. Always verify at the [AWS Pricing Console](https://aws.amazon.com/ec2/pricing/) before purchasing.

### Archera

Amazon MemoryDB is a core service within Archera's commitment management scope. Archera can automate Reserved Node purchases for MemoryDB clusters, monitor utilization across size-flexible node families, and wrap commitments in a GRI/GSP — eliminating downside risk on over-commitment while preserving the full reservation discount.

***

**Sources**

* [Pricing for Amazon MemoryDB](https://aws.amazon.com/memorydb/pricing/)
* [MemoryDB reserved nodes](https://docs.aws.amazon.com/memorydb/latest/devguide/nodes.reservednodes.html)
* [Offering types — Amazon MemoryDB](https://docs.aws.amazon.com/memorydb/latest/devguide/reserved-nodes-offerings.html)
* [Announcing Reserved Nodes for Amazon MemoryDB for Redis](https://aws.amazon.com/about-aws/whats-new/2022/12/amazon-memorydb-redis-reserved-nodes/)

⚠️ Discount percentages are approximate and region/node-type-dependent. Always verify with the [AWS Pricing Calculator](https://calculator.aws/pricing/2/home).


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