Stores

• 35 Database/datastores and 5 SPARQL tools listed at  http://www.semantic-web.at/30.9917.semantic-web-tools.htm

Existing storage

• Triple stores
  •  Virtuoso Semantic Web Tools
  •  4store
    •  Mac OS X 10.6 Mach-O 64-bit executable x86_64 package
    •  Steve Harris, et al., 4store: The Design and Implementation of a Clustered RDF Store, SSWS09
  • AllegroGraph
  •  Sesame
  •  Jena
  •  Redland
  •  Mulgara
  •  bigdata
  • ORACLE
  • :

• RDB, NoSQL, KVS (Key-value store) ?
  •  TokyoCabinet is a library of routines for managing a database. The database is a simple data file containing records, each is a pair of a key and a value. Every key and value is serial bytes with variable length. Both binary data and character string can be used as a key and a value. There is neither concept of data tables nor data types. Records are organized in hash table, B+ tree, or fixed-length array.
  •  CouchDB is a document-oriented database that can be queried and indexed in a MapReduce fashion using JavaScript. CouchDB also offers incremental replication with bi-directional conflict detection and resolution.
  •  Terrastore is based on Terracotta, so it relies on an industry-proven, fast (and cool) clustering technology. Is a modern document store which provides advanced scalability and elasticity features without sacrificing consistency.
  •  Neo4j is a graph database. It is an embedded, disk-based, fully transactional Java persistence engine that stores data structured in graphs rather than in tables.
  • MongoDB

Query interfaces

• SPARQL
  •  RelFinder
  •  Sheaflight
  •  VisiNav
  •  SIMILE/Exhibit
  •  http://lod.openlinksw.com/fct
  •  http://lod.openinksw.com/isparql
  •  http://www.tecweb.inf.puc-rio.br/explorator
• SPARQL endpoints
  •  SPARQL endpoint provided by Bio2RDF
  •  http://atlas.bio2rdf.org/sparql
  •  http://beta.dbcls.jp/virtuoso/sparql
  •  http://lod.openlinksw.com/sparql

Evaluation

• Scale?
• Speed
• Interface