{"id":444,"date":"2011-03-10T05:33:24","date_gmt":"2011-03-10T11:33:24","guid":{"rendered":"http:\/\/blog.supportpro.com\/?p=444"},"modified":"2026-03-09T01:12:01","modified_gmt":"2026-03-09T07:12:01","slug":"memcache","status":"publish","type":"post","link":"https:\/\/www.supportpro.com\/blog\/memcache\/","title":{"rendered":"What is Memcached? Working, Benefits and Installation Guide"},"content":{"rendered":"\n<p>In today\u2019s web hosting environment, databases play a critical role in powering websites and applications. Many modern platforms depend heavily on databases such as <strong>MySQL<\/strong> to store and retrieve large amounts of data. However, when websites receive heavy traffic, database queries can increase significantly, which may slow down performance.<\/p>\n\n\n\n<p>To handle high traffic and reduce downtime, many large websites use database clustering and caching solutions. One of the most popular tools used for this purpose is <strong>Memcached<\/strong>, a distributed memory caching system designed to improve the speed and scalability of dynamic web applications.<\/p>\n\n\n\n<p>Memcached was originally developed by <strong>Brad Fitzpatrick<\/strong> to help manage database load more efficiently. Today, it is widely used by high-traffic websites to reduce database queries and improve overall application performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What is Memcached?<\/strong><\/h3>\n\n\n\n<p>Memcached is a <strong>high-performance distributed memory caching system<\/strong> that stores frequently accessed data in memory. By caching data, it reduces the number of direct requests made to the database.<\/p>\n\n\n\n<p>This caching technique significantly improves the loading speed of dynamic websites. Instead of repeatedly querying the database, the application retrieves data directly from memory, which is much faster.<\/p>\n\n\n\n<p>Memcached is widely used by dynamic platforms such as <strong>Twitter<\/strong>, <strong>YouTube<\/strong>, and <strong>Flickr<\/strong> to handle large numbers of user requests efficiently.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Why Memcached is Important for High-Traffic Websites<\/strong><\/h3>\n\n\n\n<p>Dynamic websites often perform multiple database queries whenever a page is requested. As traffic increases, the database must process more queries, which can lead to performance issues.<\/p>\n\n\n\n<p>Memcached helps solve this problem by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reducing the number of database queries<\/li>\n\n\n\n<li>Storing frequently accessed data in memory<\/li>\n\n\n\n<li>Improving page load times<\/li>\n\n\n\n<li>Lowering server resource usage<\/li>\n\n\n\n<li>Supporting high-traffic environments<\/li>\n<\/ul>\n\n\n\n<p>This makes Memcached an ideal solution for applications that rely heavily on database operations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>How Memcached Works<\/strong><\/h3>\n\n\n\n<p>To understand how Memcached improves performance, consider the following scenario.<\/p>\n\n\n\n<p>Imagine you have launched a new website that includes images, videos, and downloadable content. Initially, the website may perform well when accessed by only a few users. However, once the site becomes popular and thousands of users begin visiting it, the number of database queries increases dramatically.<\/p>\n\n\n\n<p>Without caching, the server must process every database request individually. This increases server load and slows down response times.<\/p>\n\n\n\n<p>Memcached solves this problem by storing frequently requested data in memory.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Step-by-Step Process<\/strong><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>A user requests a webpage from the server.<\/li>\n\n\n\n<li>The application sends a query to the database.<\/li>\n\n\n\n<li>Memcached stores the result of that query in memory.<\/li>\n\n\n\n<li>When another user requests the same data, Memcached returns the cached result instead of querying the database again.<\/li>\n<\/ol>\n\n\n\n<p>Since memory access is much faster than database queries, this process greatly improves website performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Hash Tables in Memcached<\/strong><\/h3>\n\n\n\n<p>Memcached uses <strong>hash tables<\/strong> to store cached data.<\/p>\n\n\n\n<p>Each piece of cached information is stored using a unique key. When the application requests data, Memcached quickly retrieves it using this key.<\/p>\n\n\n\n<p>If the cache becomes full, Memcached automatically removes older data to make room for new entries. This process ensures efficient use of available memory.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Platform Compatibility<\/strong><\/h3>\n\n\n\n<p>Memcached is <strong>free and open-source software<\/strong> that supports multiple operating systems, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Linux<\/li>\n\n\n\n<li>Windows<\/li>\n\n\n\n<li>macOS<\/li>\n<\/ul>\n\n\n\n<p>This flexibility allows developers to integrate Memcached into various server environments.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How to Install Memcached on Linux<\/strong><\/h2>\n\n\n\n<p>Below are the basic steps to install and configure Memcached on a Linux server.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Enable EPEL Repository<\/strong><\/h3>\n\n\n\n<p>First, enable the <strong>Extra Packages for Enterprise Linux (EPEL)<\/strong> repository.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>rpm -Uvh http:\/\/download.fedora.redhat.com\/pub\/epel\/5\/i386\/epel-release-5-4.noarch.rpm<\/code><\/pre>\n\n\n\n<p>This repository contains additional packages required for installation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Install Memcached<\/strong><\/h3>\n\n\n\n<p>Install Memcached using the package manager.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>yum install memcached<\/code><\/pre>\n\n\n\n<p>The installation process will automatically download required dependencies such as <strong>libevent<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Configure Memcached<\/strong><\/h3>\n\n\n\n<p>After installation, configure Memcached by editing the configuration file.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>vi \/etc\/sysconfig\/memcached<\/code><\/pre>\n\n\n\n<p>A typical configuration file looks like this:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>PORT=\"11211\"<br>USER=\"memcached\"<br>MAXCONN=\"1024\"<br>CACHESIZE=\"64\"<br>OPTIONS=\"\"<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Configuration Options<\/strong><\/h4>\n\n\n\n<figure class=\"wp-block-table\"><div class=\"pcrstb-wrap\"><table class=\"has-fixed-layout\"><thead><tr><th>Parameter<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td>PORT<\/td><td>Default port used by Memcached (11211)<\/td><\/tr><tr><td>USER<\/td><td>System user running the Memcached service<\/td><\/tr><tr><td>MAXCONN<\/td><td>Maximum number of simultaneous connections<\/td><\/tr><tr><td>CACHESIZE<\/td><td>Amount of memory allocated for caching<\/td><\/tr><tr><td>OPTIONS<\/td><td>Additional configuration options<\/td><\/tr><\/tbody><\/table><\/div><\/figure>\n\n\n\n<p>For better security, you can restrict access to a specific internal IP address:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">OPTIONS=\"-l 3.3.3.3\"<\/pre>\n\n\n\n<p>This allows only local network access to the Memcached service.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. Start Memcached Service<\/strong><\/h3>\n\n\n\n<p>Enable and start the Memcached service.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>chkconfig memcached on<br>\/etc\/init.d\/memcached start<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">5. Stop or Restart Memcached<\/h3>\n\n\n\n<p>You can stop or restart the service using the following commands:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/etc\/init.d\/memcached stop<br>\/etc\/init.d\/memcached restart<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">6. Check Memcached Memory Usage<\/h3>\n\n\n\n<p>To monitor memory usage, use the <strong>memcached-tool<\/strong> command.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>memcached-tool IP_ADDRESS:PORT<\/code><\/pre>\n\n\n\n<p>Example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>memcached-tool 127.0.0.1:11211<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">7. Check Memcached Statistics<\/h3>\n\n\n\n<p>You can also view detailed statistics about the server.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>memcached-tool IP_ADDRESS:PORT stats<\/code><\/pre>\n\n\n\n<p>Example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>memcached-tool 127.0.0.1:11211 stats<\/code><\/pre>\n\n\n\n<p>This command displays information such as memory usage, connections, and cache hits.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Benefits of Using Memcached<\/h2>\n\n\n\n<p>Using Memcached offers several advantages for web applications:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Faster website performance<\/li>\n\n\n\n<li>Reduced database load<\/li>\n\n\n\n<li>Better scalability for high-traffic applications<\/li>\n\n\n\n<li>Improved response times<\/li>\n\n\n\n<li>Efficient memory-based caching<\/li>\n<\/ul>\n\n\n\n<p>Because of these benefits, Memcached is commonly used by large-scale web applications and online platforms.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Memcached is a simple yet powerful caching solution that significantly improves the performance of database-driven applications. By storing frequently accessed data in memory, it reduces the load on databases like <strong>MySQL<\/strong> and ensures faster response times for users.<\/p>\n\n\n\n<p>For websites that handle heavy traffic or complex database operations, implementing <strong>Memcached<\/strong> can greatly enhance scalability and reliability.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.supportpro.com\/requestquote.php\" title=\"\">Need Help Optimizing Your Server Performance?<\/a><\/strong><\/p>\n\n\n\n<p>Our experts can help you install, configure, and optimize <strong>Memcached<\/strong> to improve database performance and handle high traffic efficiently.<\/p>\n\n\n\n<p class=\"has-text-align-center\"><span id=\"hs-cta-wrapper-9d590242-d641-4383-94b4-8cfd62f0af6b\" class=\"hs-cta-wrapper\"><span id=\"hs-cta-9d590242-d641-4383-94b4-8cfd62f0af6b\" class=\"hs-cta-node hs-cta-9d590242-d641-4383-94b4-8cfd62f0af6b\"><a href=\"https:\/\/cta-redirect.hubspot.com\/cta\/redirect\/2725694\/9d590242-d641-4383-94b4-8cfd62f0af6b\"><img decoding=\"async\" id=\"hs-cta-img-9d590242-d641-4383-94b4-8cfd62f0af6b\" class=\"hs-cta-img\" style=\"border-width: 0px;\" src=\"https:\/\/no-cache.hubspot.com\/cta\/default\/2725694\/9d590242-d641-4383-94b4-8cfd62f0af6b.png\" alt=\"Server not running properly? Get A FREE Server Checkup By Expert Server Admins - $125 Value\"><\/a><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In today\u2019s web hosting environment, databases play a critical role in powering websites and applications. Many modern platforms depend heavily on databases such as MySQL to store and retrieve large&hellip;<\/p>\n","protected":false},"author":4,"featured_media":15977,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-444","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-miscellaneous"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.supportpro.com\/blog\/wp-json\/wp\/v2\/posts\/444","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.supportpro.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.supportpro.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.supportpro.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.supportpro.com\/blog\/wp-json\/wp\/v2\/comments?post=444"}],"version-history":[{"count":5,"href":"https:\/\/www.supportpro.com\/blog\/wp-json\/wp\/v2\/posts\/444\/revisions"}],"predecessor-version":[{"id":15978,"href":"https:\/\/www.supportpro.com\/blog\/wp-json\/wp\/v2\/posts\/444\/revisions\/15978"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.supportpro.com\/blog\/wp-json\/wp\/v2\/media\/15977"}],"wp:attachment":[{"href":"https:\/\/www.supportpro.com\/blog\/wp-json\/wp\/v2\/media?parent=444"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.supportpro.com\/blog\/wp-json\/wp\/v2\/categories?post=444"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.supportpro.com\/blog\/wp-json\/wp\/v2\/tags?post=444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}