In my QCon talk Horizontal Scalability via Transient, Shardable, Share-Nothing Resources, I argued that memcached is the father of modern shardable resources. Today’s NoSQL key-value stores all owe some part of their inspiration to memcached. Even feature-rich datastores such as CouchDB or Cassandra also borrow a cornerstone idea from memcached: throw away some features historically associated with databases in order to make big gains in scalability and resiliency.

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Graph databases are a type of datastore which treat the relationship between things as equally important to the things themselves. Examples of datasets that are natural fits for graph databases:

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