memcached - 为什么是内存缓存？

Question

我试图了解使用 memcached 之类的解决方案需要什么。这似乎是一个愚蠢的问题 - 但如果我只需要缓存对象，它会给表带来什么 - 一个简单的哈希图不会吗？

Answer 1

引自 memcache web site , 内存缓存是…

Free & open source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.

Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects) from results of database calls, API calls, or page rendering. Memcached is simple yet powerful. Its simple design promotes quick deployment, ease of development, and solves many problems facing large data caches. Its API is available for most popular languages.

At heart it is a simple Key/Value store

这里的一个关键词是 分布式 .一般来说，再次引用memcache站点，

Memcached servers are generally unaware of each other. There is no crosstalk, no syncronization, no broadcasting. The lack of interconnections means adding more servers will usually add more capacity as you expect. There might be exceptions to this rule, but they are exceptions and carefully regarded.

我强烈建议阅读 detailed description of memcache .