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]

Contents 1 Limitations of SimpleDB 1.1 Store limitations 1.2 Query limitations 2 References 3 External links

[edit] Limitations of SimpleDB

Published limitations^[5]:

[edit] Store limitations

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 characters

[edit] Query limitations

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

[edit] References

1. ^ What You Need To Know About Amazon SimpleDB
2. ^ Amazon SimpleDB- Limited Beta
3. ^ SimpleDB - Free Tier - A shift in AWS pricing
4. ^ Amazon SimpleDB official home page
5. ^ Amazon SimpleDB Limits, Amazon SimpleDB Developer Guide (API Version 2007-11-07)

[edit] External links

• Amazon SimpleDB official home page
• NSimpleDB - Open source C# implementation of the SimpleDB data model for the desktop; can also be used as a proxy for SimpleDB
• M/DB - a Free Open Source API-compatible alternative to SimpleDB that can be used as a local or cloud database
• Simple Savant - An advanced C# interface to SimpleDB
• typica - A Java client for SimpleDB and other Amazon Web Services

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