Drupal uses a variety of caching systems to improve the site performance. However in certain scenarios they may not be sufficient and more powerful external caching mechanisms are required to improve the performance. One such mechanism is memcached. If you want to know how to install memcached in CentOs then read on to know the steps.
Memcache
Memcache is used for increasing the speed of dynamic web applications by loading the web page faster. Memcache is used to reduce the number of hits to the database by loading the page from the memory. Memcache works for all types of users (both anonymous and admin) since it caches data like sessions, forms, blocks etc in RAM.