Neo4j

Neo4j Adam Foust

Road Map • • • • •

Introduction to Neo4j NoSQL databases Graph databases How Neo4j works Comparison

Introducing Neo4j • • • •

Introduced in 2010 Open source Java-based NoSQL Graph Database

NoSQL databases • Four classes of NoSQL databases – Key-value store • Amazon’s Simple DB

– Column-family or big table databases • Google’s Big Table • Apache Cassandra database

– Document-oriented • MongoDB

– Graph Databases • Neo4j

Graph Database • Neo4j is a graph database • Database full of linked nodes • Stores data as nodes and relationships

Graph Database (cont.) • Nodes represent entities • Edges represent relationships

• • • •

Connections between data are explored Faster for associative data sets Intuitive Optimal for searching social network data

How Neo4j Works Storing Objects • Domain objects take a node • Jo4neo framework 

public class Person { //used by jo4neo transient Nodeid node; //simple property @neo String firstName; //helps you store a java.util.Date to neo4j @neo Date date; // jo4neo will index for you @neo(index=true) String email; // many to many relation @neo Collection roles; /* normal class oriented * programming stuff goes here */ }

How Neo4j Works (cont.) Dealing with complexity • Simple domains can be complex • Mutual Friend example

Case Study • A side by side comparison of a relational database and Neo4j • Artificially generated graph dataset with natural statistics • 1 million vertices and 4 million edges

Case Study Results • First 250 vertices used as roots

Result Conclusion • Neo4j proved to take less than half the time of the SQL database. • Neo4j is optimal

Conclusion • • • • •

Introduced Neo4j Discussed NoSQL databases Went over graph databases How Neo4j works Case study

Questions?

References • • • • • • • • • • •

"Ayende @ Rahien." That No SQL Thing: Column (Family) Databases -. N.p., n.d. Web. 13 Mar. 2013. . WebsiteLinkTagsEditDelete "Graph Database." Wikipedia. Wikimedia Foundation, 03 June 2013. Web. 13 Mar. 2013. . WebsiteLinkTagsEditDelete Krill, Paul. "Neo Technology Execs: How Neo4j Beat Oracle Database." InfoWorld. N.p., n.d. Web. 13 Mar. 2013. . WebsiteLinkTagsEditDelete "MySQL vs. Neo4j on a Large-Scale Graph Traversal." Javalobby. N.p., 12 May 2011. Web. 13 Mar. 2013. . WebsiteLinkTagsEditDelete "Neo4j Blog." : The Top 10 Ways to Get to Know Neo4j. N.p., n.d. Web. 13 Mar. 2013. . WebsiteLinkTagsEditDelete "Processing MongoDB for and Open-Data Portal, MongoDB Emerges as NoSQL Leader." Magazine for Software Developers Programmers and Designers Software Developers Journal. N.p., n.d. Web. 13 Mar. 2013. .

Applause