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This article is about why redis is used. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.

Redis is an open source, web-enabled, memory-based and persistent log, Key-Value database written in ANSI C and available in multiple languages. Since March 15, 2010, development of Redis has been hosted by VMware. Since May 2013, Redis development has been sponsored by Pivotal.

Why use redis?

For example, if there are 20 million user information in the system, the user information is basically fixed, once the input rarely changes, then every time you load all the user information, if you have to request the database, the database compiles and executes your query statement, so the efficiency will be much lower.

In larger cases, the usual practice is to add it to the cache, to judge before each fetch, if the cache is not empty, then from the cache value, if empty, and then to request the database, and add the data to the cache, which greatly improves the system access efficiency.

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