QCon 2010 London - Not Only SQL, Emil Eifrém, Neo4J

Here are my notes from the "Not Only SQL: Alternative Data Persistence and Neo4J"-session from Emil Eifrém (@emileifrem) at QCon London 2010. Please note that these are my notes and I might have misinterpreted some parts of the session, hence, read at own risk :-)

4 trends during 2009 that lead up to NOSQL

• #1 data set size: more data will be created during 2010 than all previous years together
• #2 connectedness: blogs, wikis, tagging, ontologies, …
• #3 semi-strucuture
• #4 architecture

The meaning of the term NOSQL is:

• not "Never SQL"
• not "No To SQL"
• is "Not Only SQL"

4 Emerging Categories of NOSQL

• key-value stores (based on Amazon's Dynamo Paper). Example Programmes

  : Dynomyte, Voldemort
• big table clones (based on Google's Big Table Paper). E

  xample Programmes: HBase, Hypertable, Cassandra (which is used by e.g. Twitter)
• document databases (collection of key-value pairs, inspired by Lotus Notes!). E

  xample Programmes: CouchDB, MongoDB
• graph databases (nodes, relations, key-value pairs). E

  xample Programmes: Sones, Neo4J, AllegroGraph

Grap Database Neo4J

• disk based
• JTA/transactional
• whiteboard friendly: model your datamodel on a whiteboard and the implementation will look about the same!
• scales up
• robust

Go check it out here Neo4J. I know I will!