• List of different systems
• Yahoo Cloud Service Benchmark: Compare systems

• Pnuts, HBase, Cassandra
• Cassandra vs HBase
• NoSQL Tracking Sheet
• Overview: How I decided to go with the systems below

• MySQL

• Redis
• Riak

• Cassandra
• HBase

• CouchDB
• MongoDB

• Neo4j
• HypergraphDB

Every storage system supports different clients. The storage systems are written in C, Java, Erlang and other languages. Some offer a REST-ful API. I decided to use the Java language to connect to the different database systems. The reasons for this are as following:

• All systems I'm going to evaluate have a Java client
• Java is fast (compared to PHP, Python, …)
• Neo4j is only accessible through Java (more clients are coming …)

• Triple stores: optimized for RDP triples (optimized index structure)
• Quad store: Also for RDF, with addtional context. See YARS2: A Federated Repository for Querying Graph Structured Data from the Web