NoSQL Not Only SQL Edel Sherratt

What is NoSQL? Not Only SQL Large volumes of data No schema Partition tolerance – scale by adding more commodity servers Various data models Various languages Eventual consistency

Some NoSQL database systems Oracle NoSQL Database Apache Cassandra Apache CouchDB Apache HBase mongoDB Google Bigtable Redis Riak Neo4j FlockDB MarkLogic

NoSQL users and applications adform, digital advertising Iovation, fraud prevention IBM, client back-end HP, music streaming Many, many more

National Library of Wales Welsh newspapers online January 2013 Hacathon – Pagehttp://hacathonwiki.llgc.org.uk/w/index.php/Main_ Page Data documentation, mentions couchdb: – _introduction_to_the_datahttp://hacathonwiki.llgc.org.uk/w/index.php/Simple _introduction_to_the_data – cumentation cumentation Current public interface: –

Some advantages of NoSQL Scale using clusters of commodity hardware rather than specialist servers Handle larger volumes of data and higher transaction rates than rdbms Less need for database administrators Lower startup costs Lower expansion costs Few, if any data model restrictions

Some disadvantages NoSQL immaturity means expert support scarce Many data manipulation languages –reduces portability of queries –reduces transferability of skills No schema, reduces database maintainability No normalization challenges consistency Whole document emphasis challenges analysis of data sets

Summary Characteristics of NoSQL Some NoSQL databases Advantages and disadvantages