Cache, Cache, Cache…
Cache, cache, cache… it is used in various form in most applications. Among others, few cache types are: * opcode cache/accelerators such as APC for PHP * in-memory cache, very often it’s just hash table * distributed hash table like Memcached * CPU and its L1/L2/L3 * browser cache * and many others… Starting from ORM that caches query results, through typical CRUD applications that use cache for storing data, to your browser that caches static resources - cache is everywhere.
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