Memcached是免费的,开源的,高性能的,分布式内存对象的缓存系统(键/值字典),旨在通过减轻数据库负载加快动态Web应用程序的使用。

Memcached是由布拉德·菲茨帕特里克(Brad Fitzpatrick)在2003年为LiveJournal 开发的,现在有很多知名网站都在使用,包括:Netlog, Facebook, Flickr, Wikipedia, Twitter, YouTube等。 

memcached 主要特点是:

  • 开源

  • memcached服务器是一个很大的哈希表

  • 显著减少数据库负载。

  • 非常适合高负载的数据库网站。

  • 在BSD许可下发布

  • 从技术上来说,它是在通过TCP或UDP在服务器和客户端之间来访问。

不要使用memcached来做什么?

  • 持久性数据存储

  • 数据库

  • 特殊应用

  • 大对象缓存

  • 容错或高可用性


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