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<h1>Caching</h1>

<p>Caching can reduce load on servers by storing the results of common

operations and serving the precomputed answers to clients.</p>

<p>For example, instead of retrieving data from database tables that rarely

change, you can store the values in-memory. Retrieving values from an

in-memory location is far faster than retrieving them from a database (which

stores them on a persistent disk like a hard drive). When the cached values

change the system can invalidate the cache and re-retrieve the updated values

for future requests.</p>

<p>A cache can be created for multiple layers of the stack.</p>

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<h2>Caching Resources</h2>

<p><a class="reference external" href="http://memcached.org/">memcached</a> is a common in-memory caching system.</p>

<p><a class="reference external" href="http://redis.io/">Redis</a> is a key-value in-memory data store that can

easily be configured for caching with libraries such as

<a class="reference external" href="https://github.com/sebleier/django-redis-cache">django-redis-cache</a>.</p>

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Next read the

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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>

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

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<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>

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

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

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

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