Amazon SimpleDB is a distributed database written in Erlang[1] by Amazon.com. It is used as a web service in concert with Amazon Elastic Compute Cloud (EC2) and Amazon S3 and is part of Amazon Web Services. It was announced on December 13, 2007.[2]
As with EC2 and S3, Amazon charges fees for SimpleDB storage, transfer, and throughput over the Internet. On December 1st 2008, Amazon introduced a new pricing with free tier[3] for 1 GB of data & 25 machine hours. Transfer to other Amazon Web Services is free of charge.[4]
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Published limitations[5]:
| Attribute | Maximum |
|---|---|
| domains | 100 active domains |
| size of domains | 10GB |
| attributes per domain | 1,000,000,000 |
| attributes per item | 256 attributes |
| size per attribute | 1024 bytes |
| Attribute | Maximum |
|---|---|
| items returned in a query response | 2500 items |
| seconds a query may run | 5 seconds |
| attribute names per query predicate | 1 attribute name |
| comparisons per predicate | 20 operators |
| predicates per query expression | 20 predicates |
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   | NSimpleDB - Open source C# implementation of the SimpleDB data model for the desktop; can also be used as a proxy for SimpleDB - nsimpledb - Project Hosting on Google Code |
| | Amazon SimpleDB and CouchDB compare. - The Electrofriend: Amazon SimpleDB and CouchDB compared |
| | M/DB - a Free Open Source API-compatible alternative to SimpleDB that can be used as a local or cloud database - M/Gateway Developments Ltd |
| | Simple Savant - An advanced C# interface to SimpleDB - Simple Savant - Home |
| | SimpleDB - Free Tier - A shift in AWS pricing - SimpleDB - 2,000,000 FREE requests for next six months. | SimpleDB Explorer - making Amazon SimpleDB Simple to use |
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