Amazon SimpleDB
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Amazon SimpleDB is a distributed database written in Erlang 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. As with EC2 and S3, Amazon charges fees for SimpleDB storage, transfer, and throughput over the Internet. On December 1, 2008, Amazon introduced new pricing with Free Tier for 1 GB of data & 25 machine hours. Transfer to other Amazon Web Services is free of charge.
Amazon SimpleDB is a distributed database written in Erlang 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. As with EC2 and S3, Amazon charges fees for SimpleDB storage, transfer, and throughput over the Internet. On December 1, 2008, Amazon introduced new pricing with Free Tier for 1 GB of data & 25 machine hours. Transfer to other Amazon Web Services is free of charge. ==Limitations== SimpleDB provides eventual consistency, which is a weaker form of consistency, compared to other database management systems. This is often considered a limitation, because it is harder to reason about, which makes it harder to write correct programs that make use of SimpleDB. This limitation is the result of a fundamental design trade-off. By forgoing consistency, the system is able to achieve two other highly desirable properties: availability – components of the system may fail, but the service will continue to operate correctly. partition tolerance – components in the system are connected by a computer network. If components are not able to contact one another using the network (a condition known as a network partition), the operation of the system will continue. Component failures are assumed to be inevitable; thus, both of these properties were deemed necessary in order to provide a reliable web service. The CAP theorem states that it is not possible for a system to exhibit these properties along with consistency; thus, the designers need to settle for a weaker form of consistency. Published limitations: ===Store limitations=== ===Query limitations=== ==External links== Amazon SimpleDB official home page de:Amazon Web Services#Amazon SimpleDB
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