Configuring Redis for backend cache

Redis may be one of the best improvements since we used Memcache(d) or Alternative PHP Cache (APC). For the last couple of years, Redis is available in Magento 1 and has a big performance benefit.

What is Redis and why is it important for Magento? Well, Redis is not new; its initial release dates to the beginning of 2009—almost as young as Magento 1. Redis is a key-value storage database that stores the data in-memory of your web server. Besides this, the in-memory caches are fast and also have a persistence feature that is really important when a server reboots. All caches are not flushed during a reboot and are available in-memory when the web server is up again.

In the beginning of the Magento 1 area, we used Memcache(d) or APC, which worked very well but not as well as Redis. In Magento 1, Redis was used for a backend cache and session storage most of the time. Some websites also used it as a Full Page Cache (FPC) storage.

One other great advantage of...