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What are the advantages of redis? Many novices are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can gain something.

Redis is completely open source and free, complies with the BSD protocol, and is a high-performance key-value database. It is one of the most popular NoSql databases, and it is also called data structure server.

Then why use Redis's? The reason is simple. Come on!

This problem must be considered in highly concurrent, high-load websites. All data in the redis database is stored in memory. Because the read and write speed of memory is much faster than that of hard disk, the performance of Redis has a very obvious advantage over other databases based on hard disk storage.

Those who use Redis in the project are mainly considered from two angles: performance adverbial clause: concurrency. Of course, Redis also has other functions such as distributed locks, but if it is only for distributed locks and other functions, there are other middleware to replace, it is not necessary to use Redis.

Therefore, this question is mainly answered from the perspectives of performance and concurrency.

Performance:

When we encounter a SQL that takes a long time to execute and the results do not change frequently, it is especially suitable to put the running results in the cache, so that the subsequent requests are read in the cache and the requests can respond quickly.

Concurrency:

In the case of large concurrency, all requests directly access the database, and the database will have a connection exception. At this time, you need to use the Redis to do a buffering operation so that the request accesses the Redis first instead of directly accessing the database.

Advantages of redis:

1, running in memory, fast official claim to support concurrent 11 watt read operation, concurrent 8 watt close-up operation, can be said to be quite tough.

2. Although the data is in memory, it provides persistence support, that is, the data in memory can be asynchronously written to the hard disk without affecting the continued provision of services.

3. Supports rich data structures (string (string), list (linked list), set (collection), zset (sorted set-ordered set) and Hash (hash type, the string encrypted by md5)

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