memcache官方定义 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. redis官方定义 Redis is an open source, BSD licensed, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets. 版权相同 它们都是使用的bsd协议，使用它的项目可以用于商业用户，不必发布二次修改的代码，...