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redis可以做什么?

redis可以做什么?

redis可以做什么?

1.缓存,毫无疑问这是Redis当今最为人熟知的使用场景。在提升服务器性能方面非常有效;

2.排行榜,如果使用传统的关系型数据库来做这个事儿,非常的麻烦,而利用Redis的SortSet数据结构能够非常方便搞定;

3.计算器/限速器,利用Redis中原子性的自增操作,我们可以统计类似用户点赞数、用户访问数等,这类操作如果用MySQL,频繁的读写会带来相当大的压力;限速器比较典型的使用场景是限制某个用户访问某个API的频率,常用的有抢购时,防止用户疯狂点击带来不必要的压力;

注:限速器也是对请求限流的一种实现方式。

4.好友关系,利用集合的一些命令,比如求交集、并集、差集等。可以方便搞定一些共同好友、共同爱好之类的功能;

5.简单消息队列,除了Redis自身的发布/订阅模式,我们也可以利用List来实现一个队列机制,比如:到货通知、邮件发送之类的需求,不需要高可靠,但是会带来非常大的DB压力,完全可以用List来完成异步解耦;

6.Session共享,默认Session是保存在服务器的文件中,即当前服务器,如果是集群服务,同一个用户过来可能落在不同机器上,这就会导致用户频繁登陆;采用Redis保存Session后,无论用户落在那台机器上都能够获取到对应的Session信息。

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文章来源:智云一二三科技

文章标题:redis可以做什么?

文章地址:https://www.zhihuclub.com/4469.shtml

关于作者: 智云科技

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