Shulou(Shulou.com)06/01 Report--

Today, Xiaobian shared with you what redis can be used for. Many people don't know much about it. In order to let everyone know more about redis, Xiaobian summarized the following contents for everyone and looked down together. I'm sure you'll find something.

First, understand what redis is.

Redis is an in-memory cache database developed by Salvatore Sanfilippo (net name: antirez). Redis is a key-value storage system that supports rich data types, such as string, list, set, zset(sorted set), hash.

Features of redis

Redis uses memory as a data storage medium, so the efficiency of reading and writing data is extremely high, far exceeding the database. Take setting and fetching a 256-byte string as an example, which can read up to 110000 times/s and write up to 81000 times/s.

Redis differs from memcache in that the data stored in Redis is persistent and will not be lost after power failure or restart. Because Redis storage is divided into memory storage, disk storage and log file three parts, after restart, Redis can reload data from disk to memory, these can be configured through the configuration file, because of this, Redis can achieve persistence.

Redis supports master-slave mode and can configure clusters, which is more conducive to supporting large-scale projects, which is also a highlight of Redis. (redis tutorial)

Redis application scenarios, what can it do

Many languages support Redis, because Redis exchanges data quickly, so it is often used in the server to store some data that needs to be frequently retrieved, which can greatly save the I/O overhead of the system directly reading the disk to obtain data. More importantly, it can greatly improve the speed.

Take a large website for example, for example, a website home page has 1 million people a day, including a section for recommended news. If you query directly from the database, you will consume an additional 1 million database requests per day. As mentioned above, Redis supports rich data types, so this can be done with Redis. Store this hot data in Redis (memory). When you want to use it, take it directly from memory, which greatly improves the speed and saves the server overhead.

In short, Redis application is very extensive, and extremely valuable, really a weapon in the server, so from now on, we will learn it step by step.

The above is the redis can be used to do the details of the content, after reading whether there is any harvest? If you want to know more, welcome to the industry news!

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