To use Amazon SimpleDB you:
* CREATE a new domain to house your unique set of structured data.
* GET, PUT or DELETE items in your domain, along with the attribute-value pairs that you associate with each item. Amazon SimpleDB automatically indexes data as it is added to your domain so that it can be quickly retrieved; there is no need to pre-define a schema or change a schema if new data is added later. Each item can have up to 256 attribute values. Each attribute value can range from 1 to 1,024 bytes.
* QUERY your data set using this simple set of operators: =, !=, <, > <=, >=, STARTS-WITH, AND, OR, NOT, INTERSECTION AND UNION. QUERYWITHATTRIBUTES enables developers to retrieve the information associated with items returned as a response to a particular query. Your QUERY or QUERYWITHATTRIBUTES results can be sorted using the SORT operator. Query execution time is currently limited to 5 seconds. Amazon SimpleDB is designed for real-time applications and is optimized for those use cases.
* Pay only for the resources that you consume.
Amazon Web Services