ElastiCache. ElastiCache is a web service that makes it easy to deploy, operate, and scale an in-memory cache in the cloud.
The service improves the performance of web applications by allowing you to retrieve information from fast, managed, in-memory caches, instead of relying entirely on slower disk-based databases. ElastiCache supports two open-source caching engines: Memcached - a widely adopted memory object caching system.
ElastiCache is protocol compliant with Memcached, so popular tools that you use today with existing Memcached environments will work seamlessly with the service.Redis – a popular open-source in-memory key-value store that supports data structures such as sorted sets and lists. A Tour of Amazon's DynamoDB. Amazon's recent release of DynamoDB, a database whose name is inspired by Dynamo, the key-value database the distributed datastore they've been running in production for a good five to six years now.
I think it's great they've finally done it, though from my obverservations, there's little resemblance of what the original Dynamo paper describes, but I'm getting ahead of myself. Traditionally Amazon hasn't been very open about how they implement their services, so some of what I'm stating here may be nothing more than an educated guess. Either way, the result is pretty neat. Amazon Web Services (AWS) Amazon SimpleDB is a highly available NoSQL data store that offloads the work of database administration.
Developers simply store and query data items via web services requests and Amazon SimpleDB does the rest. Unbound by the strict requirements of a relational database, Amazon SimpleDB is optimized to provide high availability and flexibility, with little or no administrative burden. Behind the scenes, Amazon SimpleDB creates and manages multiple geographically distributed replicas of your data automatically to enable high availability and data durability.