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<!DOCTYPE html>
<html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="Full Stack Python explains each layer of the web application stack, from the server up through the rendering in a user's browser.">
<meta name="author" content="Matt Makai">
<link rel="shortcut icon" href="theme/img/fsp-fav.png">
<title>Caching - Full Stack Python</title>
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<a href="https://github.com/makaimc/fullstackpython.github.com" class="github">
<img style="position: absolute; top: 0; right: 0; border: 0;" src="http://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on GitHub" />
</a>
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<a href="/" style="text-decoration: none; border: none;"><img src="theme/img/fsp-logo.png" height="52" width="52" class="logo-image" style="padding-top: 1px;"/></a>
<span class="logo-title"><a href="/">Full Stack Python</a></span>
</div>
</div>
</div>
<div class="row">
<div class="col-md-8">
<h1>Caching</h1>
<p>Caching can reduce the 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>
<h2>Caching backends</h2>
<ul>
<li>
<p><a href="http://memcached.org/">memcached</a> is a common in-memory caching system.</p>
</li>
<li>
<p><a 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 href="https://github.com/sebleier/django-redis-cache">django-redis-cache</a>.</p>
</li>
</ul>
<h2>Caching resources</h2>
<ul>
<li>"<a href="https://bjornjohansen.no/caching-varnish-or-nginx">Caching: Varnish or Nginx?</a>"
reviews some considerations such as SSL and SPDY support when choosing
reverse proxy Nginx or Varnish.</li>
</ul>
<h3>What do you want to learn now that your app is responding faster?</h3>
<div class="row">
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<a href="/source-control.html" class="btn btn-success btn-full"><i class="fa fa-code-fork fa-inverse fa-2x"></i></a>
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<div class="panel panel-success">
<div class="panel-heading"><h3 class="panel-head">Caching</h3></div>
<div class="panel-body">
<a href="/">Full Stack Python</a> is an open source book explaining
each layer of the Python web application stack along with the
best Python resources from around the web.
<hr/>
<a href="http://twitter.com/mattmakai">Matt Makai</a> designed and
wrote this site with assistance from community pull
requests. If you're on GitHub you can
<a href="https://github.com/makaimc">follow him</a>
to see what daily changes are made or
<a href="https://github.com/makaimc/fullstackpython.github.com">star the repository</a> for future reference.
</div>
</div>
<div class="panel panel-success">
<div class="panel-heading">
<h3 class="panel-head">Table of Contents</h3>
</div>
<div class="list-group">
<a href="/introduction.html" class="list-group-item smaller-item ">Introduction</a>
<a href="/bottle.html" class="list-group-item smaller-item ">Bottle</a>
<a href="/deployment.html" class="list-group-item smaller-item ">Deployment</a>
<a href="/other-web-frameworks.html" class="list-group-item smaller-item ">Other Web Frameworks</a>
<a href="/servers.html" class="list-group-item smaller-item ">Servers</a>
<a href="/web-frameworks.html" class="list-group-item smaller-item ">Web Frameworks</a>
<a href="/django.html" class="list-group-item smaller-item ">Django</a>
<a href="/operating-systems.html" class="list-group-item smaller-item ">Operating Systems</a>
<a href="/flask.html" class="list-group-item smaller-item ">Flask</a>
<a href="/web-servers.html" class="list-group-item smaller-item ">Web Servers</a>
<a href="/platform-as-a-service.html" class="list-group-item smaller-item ">Platform-as-a-service</a>
<a href="/databases.html" class="list-group-item smaller-item ">Databases</a>
<a href="/wsgi-servers.html" class="list-group-item smaller-item ">WSGI Servers</a>
<a href="/application-dependencies.html" class="list-group-item smaller-item ">Application Dependencies</a>
<a href="/cascading-style-sheets.html" class="list-group-item smaller-item ">Cascading Style Sheets</a>
<a href="/javascript.html" class="list-group-item smaller-item ">JavaScript</a>
<a href="/static-content.html" class="list-group-item smaller-item ">Static Content</a>
<a href="/source-control.html" class="list-group-item smaller-item ">Source Control</a>
<a href="/caching.html" class="list-group-item smaller-item active">Caching</a>
<a href="/task-queues.html" class="list-group-item smaller-item ">Task Queues</a>
<a href="/api-integration.html" class="list-group-item smaller-item ">API Integration</a>
<a href="/no-sql-datastore.html" class="list-group-item smaller-item ">NoSQL Data Stores</a>
<a href="/web-application-security.html" class="list-group-item smaller-item ">Web Security</a>
<a href="/logging.html" class="list-group-item smaller-item ">Logging</a>
<a href="/monitoring.html" class="list-group-item smaller-item ">Monitoring</a>
<a href="/configuration-management.html" class="list-group-item smaller-item ">Configuration Management</a>
<a href="/web-analytics.html" class="list-group-item smaller-item ">Web Analytics</a>
<a href="/best-python-resources.html" class="list-group-item smaller-item ">Best Python Resources</a>
<a href="/about-author.html" class="list-group-item smaller-item ">About the Author</a>
<a href="/change-log.html" class="list-group-item smaller-item ">Change Log</a>
<a href="/future-directions.html" class="list-group-item smaller-item ">Future Directions</a>
</div>
</div>
</div></div>
<hr/>
<div class="footer pull-right">
<a href="http://www.mattmakai.com/" class="underline">Matt Makai</a>
2014
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