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缓存世界中的三大问题及解决方案
source link: https://juejin.im/post/5aa8d3d9f265da2392360a37
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目前的IO设备远不能满足互联网应用海量的读写请求。于是便出现了缓存，利用内存的高速读写性能来应付海量的查询请求。然而内存资源非常宝贵，将全量数据存储在内存中显然是不切合实际的。因此目前采用内存和IO结合的方式，内存只存储热点数据，而IO设备存储全量数据。 缓存
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