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      <h1>NoSQL Data Stores</h1>
<p>Relational databases store the vast majority of web application 
persistent data. However, there are several alternative classifications of 
storage representations.</p>
<ol>
<li>Key-value pair</li>
<li>Document-oriented</li>
<li>Column-family table</li>
<li>Graph</li>
</ol>
<p>These persistent data storage representations are commonly used to augment,
rather than completely replace, relational databases.</p>
<h2>Document-Oriented</h2>
<p>A document-oriented database provides a semi-structured representation for
nested data. </p>
<h2>Key-Value Pair</h2>
<p>Key-value pair data stores are based
on <a href="http://en.wikipedia.org/wiki/Hash_table">hash map</a> data structures.</p>
<h2>Graph</h2>
<p>A graph database represent and store data in three aspects: nodes, edges,
and properties. </p>
<p>A <em>node</em> is an entity, such as a person or business. </p>
<p>An <em>edge</em> is the relationship between two entities. For example, an 
edge could represent that a node for a person entity is an employee of a 
business entity. </p>
<p>A <em>property</em> represents information about nodes. For example, an entity 
representing a person could have a property of "female" or "male".</p>
<p><a href="http://www.neo4j.org/">Neo4j</a> is one of the most widely used graph 
databases and runs on the Java Virtual Machine stack.</p>
<h2>NoSQL third-party services</h2>
<p><a href="http://www.mongohq.com/home">MongoHQ</a> provides MongoDB as a service. It's
easy to set up with either a standard LAMP stack or on Heroku.</p>
<h2>NoSQL data stores resources</h2>
<p><a href="http://www.nosqlweekly.com/">NoSQL Weekly</a> is a free curated email 
newsletter that aggregates articles, tutorials, and videos about 
non-relational data stores.</p>
<p><a href="http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-vs-redis">NoSQL comparison</a>
is a large list of popular, BigTable-based, special purpose, and other
datastores with attributes and the best use cases for each one.</p>
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