Part of the Amazon Web Services family, Amazon's SimpleDB is a massively scalable and reliable key/value datastore that is exposed via a web interface and can be accessed using the Java language. SimpleDB provides a simple web services interface to create and store multiple data sets, query the data, and return the results.
Check out this demo and follow along as Andrew Glover guides you through an introduction to SimpleDB.
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We have seen a growing interest in database management systems that differ from the traditional relational model. At the heart of this is the concept of NoSQL, a term used collectively to denote database software that does not use the Structured Query Language (SQL) to interact with the database. One of the more notable NoSQL projects out there is MongoDB, an open source document-oriented database that stores data in collections of JSON-like documents. What sets MongoDB apart from other NoSQL databases is its powerful document-based query language, which makes the transition from a relational database to MongoDB easy because the queries translate quite easily.
MongoDB is a scalable, high-performance, document-oriented schemaless database. In this short demo, long-time developerWorks contributor Andrew Glover introduces MongoDB, provides a quick tour of its use, and helps you understand where it's most applicable.