Redis是一个开源的,先进的key-value存储并用于构建高性能,可扩展Web应用程序的解决方案。 Redis主要的三个特点: Redis数据库完全在内存中,使用磁盘仅用于持久性。 相比许多键值数据存储Redis拥有一套较为丰富的数据类型。 Redis可以将数据复制到任意数量的从服务服务中。

Redis的优势

  • 异常快速:Redis速度非常快,每秒能执行约11万集合,约81000条每秒。

  • 支持丰富的数据类型:Redis原生支持最大多数开发人员已经知道的,像列表,集合,分类,散列等数据类型。这使得它非常容易解决各种各样的问题,因为我们知道哪些数据类型问题是可以通过它的处理得更好。

  • 操作原子性:所有Redis的操作是原子的,这保证了如果两个客户端同时访问的Redis服务器将获得更新后的值。

  • MultiUtility工具:Redis是一个多实用的工具,可以在一些像缓存,消息,队列用例中使用(Redis原生支持发布/订阅),在应用程序,如Web应用程序的会话,网络页面点击数短期数据等等。

相对于其他的key-value存储,为什么Redis不同?

  • Redis是key-value数据块,其中值可以包含更复杂的数据类型,对这些数据类型定义的原子操作不同的演进路径。

  • Redis在内存中,但持续存在磁盘上的数据库,所以它代表了不同的权衡,非常高的读写速度达到了数据集的限制,不能比内存大。在存储器的数据库的另一个优点是,复杂的数据结构存储表示简单得多(相比操作磁盘上相同的数据结构),这样Redis可以做很多,很少有内部的复杂性。


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