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NoSQL

NoSQL. Implementation and examples Maciej Matuszewski. Querying. RESTful interfaces, SQL, SQL2 (JCR), Query by example, SPARQL (RDF Query L anguage), UnQL (Unstructured Query Language), XQuery, XPath, Other. Document store.

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NoSQL

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  1. NoSQL Implementation and examples Maciej Matuszewski

  2. Querying • RESTful interfaces, • SQL, SQL2 (JCR), • Query by example, • SPARQL (RDF Query Language), • UnQL (Unstructured Query Language), • XQuery, XPath, • Other.

  3. Documentstore • Documents encapsulate and encode data (or information) in some standard formats or encodings. • Different implementations offer different ways of organizing and/or grouping documents: • Collections, • Tags, • Non-visible Metadata, • Directory hierarchies.

  4. Documentstore • Documents are addressed in the database via a unique key that represents that document. • Retrievalof documents based on their contents. • Examples: • eXist, • Apache Jackrabbit (JCR), • MongoDB (BSON – binary JSON), • Apache CouchDB (JSON database).

  5. Graph • Elements interconnected with an undetermined number of relations between them. • Any storage system that provides index-free adjacency. • RDF databases. • Examples: • Oracle Spatial and Graph.

  6. Key–valuestore • Key–value stores allow the application to store its data in a schema-less way. • The data could be stored in a datatype of a programming language or an object. • There is no need for a fixed data model. • Very fast access to data.

  7. Key–valuestore • Examples: • Eventually‐consistent key‐value store: • Apache Cassandra, • Dynamo, • Riak. • Key–value cache in RAM: • Redis, • Velocity.

  8. Key–valuestore • Examples: • Key–value stores on solid state or rotating disk: • MongoDB, • Oracle NoSQL Database, • BigTable. • Ordered key–value stores: • IBM Informix C-ISAM, • Berkeley DB.

  9. Objectdatabase • Information is represented in the form of objects as used in object-oriented programming. • Database is integrated with the programming language – the programmer can maintain consistency within one environment. • Examples: • db4o

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