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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 class="arabic simple">

<li>Key-value pair</li>

<li>Document-oriented</li>

<li>Column-family table</li>

<li>Graph</li>

<p>These persistent data storage representations are commonly used to augment,

rather than completely replace, relational databases.</p>

<div class="section" id="document-oriented">

<h2>Document-Oriented</h2>

<p>A document-oriented database provides a semi-structured representation for

nested data.</p>

<div class="section" id="key-value-pair">

<h2>Key-Value Pair</h2>

<p>Key-value pair data stores are based

on <a class="reference external" href="http://en.wikipedia.org/wiki/Hash_table">hash map</a> data structures.</p>

<div class="section" id="graph">

<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 &quot;female&quot; or &quot;male&quot;.</p>

<p><a class="reference external" 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>

<div class="section" id="nosql-third-party-services">

<h3>NoSQL third-party services</h3>

<p><a class="reference external" 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>

<div class="section" id="nosql-data-stores-resources">

<h3>NoSQL data stores resources</h3>

<p><a class="reference external" 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 class="reference external" 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>

<br/>

Next read the

<a href="/about-author.html">about</a> section.

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<a href="/introduction.html" class="list-group-item ">Introduction</a>

<a href="/servers.html" class="list-group-item ">Servers</a>

<a href="/operating-systems.html" class="list-group-item ">Operating Systems</a>

<a href="/web-servers.html" class="list-group-item ">Web Servers</a>

<a href="/platform-as-a-service.html" class="list-group-item ">Platform-as-a-service</a>

<a href="/databases.html" class="list-group-item ">Databases</a>

<a href="/wsgi-servers.html" class="list-group-item ">WSGI Servers</a>

<a href="/web-frameworks.html" class="list-group-item ">Web Frameworks</a>

<a href="/task-queues.html" class="list-group-item ">Task Queues</a>

<a href="/static-content.html" class="list-group-item ">Static Content</a>

<a href="/caching.html" class="list-group-item ">Caching</a>

<a href="/web-browsers.html" class="list-group-item ">Web Browsers</a>

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<a href="/configuration-management.html" class="list-group-item ">Configuration Management</a>

<a href="/dependency-management.html" class="list-group-item ">Application Dependencies</a>

<a href="/no-sql-datastore.html" class="list-group-item active">NoSQL Data Stores</a>

<a href="/about-author.html" class="list-group-item ">About</a>

<a href="/change-log.html" class="list-group-item ">Change Log</a>

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