The Oracle community meetup for all things relating to Oracle and Big Data / Hadoop / NoSQL within an Enterprise environment.   For less specific and more general Big Data and Hadoop community discussions please see two excellent London meetups: Big Data London meetup Hadoop User Group UK meetup  Also for a perspective on the business value of Big Data try LonData.

A London based meet-Up for those interested in Riak, distributed systems, NoSQL, and app development.

A group for users of Apache Cassandra to meet and discuss the popular "NoSQL" database. If you use Apache Cassandra in a production environment, or you are thinking about using it, you should come along to learn from others in the same boat. http://cassandra.apache.org/

This group is a place for developers to learn more about the non-relational, open source, document-oriented database MongoDB. MongoDBis the leading NoSQL database and many of the key committers are based right here in New York City. So if you are facing challenges with MySQL or Postgres or Oracle and want to explore a more flexible, scalable alternative, please join us at one of our monthly sessions.

Developers interested in learning about and working with graph databases for social, spatial, hierarchical or other highly connected data sets. We host hands-on lab sessions, technology reviews, topical lectures, and plenty of social nights. Curious about graphs, want to pimp your non-RDBMS skills? Join us!   This group coordinates meetups with the wonderful folks at Skills Matter.

A meetup to discuss Redis in London

… We have long pushed beyond the boundaries of traditional MS education; we covered topics like TDD and NHibernate as early as 2004 and today we talk about Node.JS, NoSQL alongside more traditional topics

We are the Hadoop users group for the UK based in London. We meet monthly for talks and discussion on all topics related to Hadoop. Join if your intrested in learning what Hadoop is, how people are using it with their big data problems, and to meet other people with experience running and coding on Hadoop cluster around London and the UK.

… The events will explore the challenges faced by the traditional complex RDBMS system architecture's and show Developers, Business and Government the options that the new NoSQL alternatives offer and show how they are worthy of consideration as this embryonic data market expands exponentially. We aim to promote the development the understanding of Big Data technologies and how they can be best exploited by Business and Government and are suitable for Business and IT decision makers and develo …

The MarkLogic User Group London is for users and/or fans of MarkLogic and those who are interested in learning more about MarkLogic, XML, XQuery and related technologies. MUGL meetups are free and open to anyone that wishes to attend. There is no formal membership for the group, but you can join our mailing list at http://mugl.org. Meetings are held monthly.

So What is Data Science? Why do we need Data Science? And What does a Data Scientist do? In this meetup we will discuss the tools, methods and technologies used by many startups and enterprises to analyse large scale data (big data), obtain predictive and actionable insight, generate business value from data, and exploit business opportunities from data products. We'll have data scientists talking about topics like: big data analytics,  distributed data analytics, Pig, data mining, machine learn …

This group discusses the design and implementation graph databases. These databases use graph structures with nodes, edges, and properties to represent and store information. You should join if you need to deliver systems and services for social networking, business intelligence, scientific research, or similar areas requiring fast discovery of higher-order relationships (node to edge graph structures) in large, distributed data.