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This article is about why you want to use redis. The editor thought it was very practical, so I shared it with you as a reference. Let's follow the editor and have a look.

Why use redis?

Redis database stores data in memory, and the speed of reading and writing memory is much faster than that of reading and writing hard disk, so Redis has a very obvious advantage over other databases based on hard disk storage in performance. Whether or not to use redis databases must be considered in highly concurrent, high-load websites.

Redis is a key-value storage system. Similar to Memcached, it supports relatively more value types, including string (string), list (linked list), set (collection), zset (sorted set-ordered collection), and hash (hash type). These data types support push/pop, add/remove, and take intersection union and difference sets, and richer operations, and these operations are atomic. On this basis, redis supports a variety of different sorting methods. Like memcached, data is cached in memory for efficiency. The difference is that redis will periodically write updated data to disk or modify operations to additional record files, and on this basis to achieve master-slave (master-slave) synchronization.

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