Distributed systems are characterized by exchanging state over high-latency or unreliable links. The system must be robust to both node and network failure if it is to operate reliably--however, not all systems satisfy the safety invariants we'd like. In this article, we'll explore some of the design considerations of distributed databases, and how they respond to network partitions.
Stefan Edlich, Senior Lecturer at Beuth HS of Technology Berlin, Germany, reviews NoSQL, considering its evolution, financial impact, the standards or their lack of, the current landscape, books, the leaders and some newcomers, concluding that NoSQL is here to stay.
CouchDB, a NoSQL solution, is a document-oriented database and within each document fields are stored as key-value maps. CouchDB has some unique characteristics like advanced replication. This article covers getting started, unit testing, CRUD and query operations.
In this article, authors Arun Viswanathan and Shruthi Kumar discuss how to implement common aggregation functions on a MongoDB document database using its MapReduce functionality. 7
Dr Rebecca Parsons is the Chief Technology Officer for ThoughtWorks, and a Director of the Agile Alliance. She discusses the trends in database technology, continuous design & delivery and Agile.
The rich document capabilities in MongoDB makes it possible to model many different applications. Even rigorous requirements of applications like e-commerce system are possible. 8
The need for agile, queryable, reliable, scalable storage without the pain of SQL schema migration is real. This article uses MongoDB to introduce NoSQL concepts to Java, PHP, and Python developers. 2
Brian C. Dilley covers pitfalls, & strengths of using MongoDB ("a very approachable NoSQL solution"), and introduces MJORM. The MJORM project is an annotation free MongoDB Java ORM library. 12
Couchbase has launched the first iOS App with an embedded Couchbase instance. CouchDB-enabled applications will be possible on all major mobile platforms - iOS, Android, Web OS. 1