What are the benefits of using redis?

osc_ 8eb8cps3 2021-01-21 07:39:24
benefits using redis


 Use Redis What are the benefits ?

  1. What is? Redis
    Redis By the Italians Salvatore Sanfilippo( Net name :antirez) Developed a memory cache database .Redis Its full name is :Remote Dictionary Server( Remote data services ),bai The software uses C Language writing ,Redis It's a key-value The storage system , It supports rich data types , Such as :string、list、set、zset(sorted set)、hash.
  2. Redis characteristic
    Redis Using memory as data storage medium , So the efficiency of reading and writing data is very high , Far more than databases . To set and get a 256 Byte string as an example , It can read up to 110000 Time /s, Write as fast as 81000 Time /s.
    Redis Follow memcache The difference is , Stored in the Redis The data in is persistent , After power failure or restart , And the data won't be lost . because Redis The storage of is divided into memory storage 、 Disk storage and log Three parts of the document , After restart ,Redis Data can be reloaded from disk into memory , These can be configured through configuration files , Because of this ,Redis To achieve persistence .

Redis Support master-slave mode , You can configure clusters , This is more conducive to supporting large projects , This is also Redis A highlight of .

  1. Redis Application scenarios , What can it do
    Many languages support Redis, because Redis Exchange data fast , So it is often used to store some data that needs to be called frequently in the server , This can greatly save the time for the system to read the disk directly to get the data I/O expenses , More importantly, it can greatly improve the speed . Take a large website for example , such as a The front page of the website has 100 Ten thousand people visit , One of them is recommendation news .
    Redis The application scenarios include : Cache system (“ hotspot ” data : High frequency reading 、 Low frequency writing )、 Counter 、 Message queuing system 、 Ranking List 、 Social networks and real-time systems .
     Use Redis What are the benefits ?
    Application scenarios :
    Let's give a simple example to describe Hash Application scenarios of , For example, we need to store a user information object data , Contains the following information :
    user ID For searching key, Stored value User object contains name , Age , Birthday and other information , If you use ordinary key/value Structure to store , There are mainly the following 2 Storage methods





 Use Redis What are the benefits ?
The first way is to make users ID As a search for key, Encapsulate other information into an object and store it in a serialized way , The disadvantage of this way is , Added serialization / The cost of deserialization , And when you need to modify one of the messages , You need to get the whole object back , And the modification operation needs to protect the concurrency , introduce CAS And so on .
 Use Redis What are the benefits ?
The second method is to store as many members as the user information object key-value pair , Use users ID+ The name of the corresponding property is used as a unique identifier to get the value of the corresponding property , Although it saves serialization overhead and concurrency problems , But users ID For duplicate storage , If there's a lot of that data , Memory waste is still considerable .
that Redis Provided Hash It's a good solution to this problem ,Redis Of Hash It's actually internal storage Value For one HashMap, And provides direct access to this Map Member's interface , Here's the picture : Use Redis What are the benefits ?



  in other words ,Key Still the user ID, value It's a Map, This Map Of key Is the attribute name of the member ,value It's property value , In this way, data can be modified and accessed directly through its internal Map Of Key(Redis Inside, inside Map Of key by field), That is, through key( user ID) + field( Property tags ) You can operate the corresponding attribute data , No need to store data repeatedly , It also doesn't cause serialization and concurrent modification control problems . It solved the problem very well .

If you query directly from the database , So it's going to cost more in one day 100 Ten thousand database requests . That was already said ,Redis Support rich data types , So it can be used Redis To complete , Save this hotspot data to Redis( Memory ) in , When it's time to use , Directly from memory , Greatly improve the speed and save the cost of the server .
All in all ,Redis It's widely used , And it's very valuable , It's a powerful tool in the server , So from now on , Let's learn it step by step .

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