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NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown
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NoSQL: what does it mean, how did we get here, and why should I care? - Hugo Rodger-Brown

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  • Running order
  • NoSQL doesn’t have a formal definitionIt’s subjective, and has come to mean different things to different peopleThe original use, byCarlo Strozzi, was used for a lightweight relational database that did not expose a SQL interfaceIt was reintroduced as a term used to describe open-source non-relational databases for a conference held in 2009Summary: we have the concept of a form of persistence / data storage mechanism that is fundamentally different from RDBMS
  • Normalisation is the key here.SQL is an ISO standard, and pretty much everyone can craft a SELECT statementSQL also contains complex semantics around JOIN, GROUP, ORDER BY statementsTransactions – the bank account example
  • http://nosql-database.org/
  • Transcript

    • 1. NoSQL
      South London Geek Night
      14/07/2010
    • 2. NoSQL
      What does it mean?
      RDBMS legacy and rise of NoSQL
      NoSQL classification
      Pros and Cons
      Possible use cases
      Real-world examples
      What next?
    • 3. Who am I?
      Hugo Rodger-Brown
      CTO @ Profero Connect
      twitter.com/hugorodgerbrown
      hugorodgerbrown.blogspot.com
      Things I like: SEO, Scale, Social media
      Things I don’t: Databases
    • 4. What does it mean?
      Movement, not a specification
      Subjective term (like Web 2.0)
      Originally used in 1998
      Reintroduced at Rackspace to refer to non-RDBMS
      NoSQL != No SQL
      NoSQL == Not Only SQL ?
    • 5. NoSQL Comment
    • 6. RDBMS Legacy
      Efficient data storage
      Powerful querying capabilities (SQL)
      Support ACID Transactions
      Mature, well supported
      Ubiquitous
      Bottom-up design
      Storage is cheap
      O/R Impedance
      Complex to manage
      Always the bottleneck
      Who really needs transactions?
    • 7. Rise of NoSQL
      Internet
      Google
      2006 Bigtable whitepaper (Google)
      “a sparse, distributed multi-dimensional sorted map”
      2007 Dynamo whitepaper (Amazon)
      2008 Cassandra released (Facebook)
      “a BigTable data model running on an Amazon Dynamo-like infrastructure”
      2009 Voldemort released (LinkedIn)
      “a big, distributed, persistent, fault-tolerant hash table”
    • 8. Rise of NoSQL – Amazon
      “There are many services on Amazon’s platform that only need primary-key access to a data store. For many services, such as those that provide best seller lists, shopping carts, customer preferences, session management, sales rank, and product catalog, the common pattern of using a relational database would lead to inefficiencies and limit scale and availability. Dynamo provides a simple primary-key only interface to meet the requirements of these applications.”
    • 9. NoSQL Data Store Classifications
      Key-Value store
      Amazon SimpleDB, Amazon Dynamo (Amazon), Tokyo Cabinet, Voldemort (Gilt Groupe)
      Wide-column (sparse) store
      Hadoop (Yahoo, EBay), Cassandra (Facebook), Bigtable (Google!), Azure Table Storage (MSFT), Excel(!)
      Document database
      MongoDB, CouchDB (BBC), RavenDB
      Graph database
      Neo4J, InfoGrid
      Object database
      Db4o, Versant, Perst, Cache
      Data Grids
      Infinispan, GigaSpaces, Terracotta
    • 10. Why NoSQL
      Good
      Flexible (schema-less)
      Very scalable
      Simple to use and operate
      Eventually consistent
      Cheap
      Suited to Web applications
      Bad
      Immature
      No common standards
      Poor transaction support
      Poor query support
      New mindset required
    • 11. NoSQL Use Cases
      Good Examples
      Logging data
      Shopping carts
      Favourites
      Preferences
      Session data
      Mock data providers
      Temporary / working data
      Variable schema data
      Stick with RDBMS
      Transactions (orders etc.)
      LOB applications
      Anything involving $$$
      Business-critical data
      Reporting
    • 12. Real-world Examples
    • 13. Real-world Examples
    • 14. Real-world Examples
      “As I described in an earlier blog post, the new BBC homepage has been built on a whole new technical architecture. Since launching we’ve found an issue with the service we use to save users’ customisation settings. Although we ran a public beta for more than 2 months, this problem only became apparent when we moved the whole audience across to the new site, increasing the load on the platform 20 times. Despite thorough load testing before launch we were unable to accurately predict the type and combination of customisations that users would perform, and as a result we now need to re-architect the way we save your homepage customisation settings in a more efficient way.”
    • 15. Summary
      NoSQL is not a replacement for RDBMS
      No two scenarios are the same
      Use best tool for the job
      Experiment
    • 16. Demo - CouchDB

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