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既生 Redis 何生 LevelDB ？
source link: https://juejin.im/post/5c22e049e51d45206d12568e
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了解 Redis 的同学都知道它是一个纯内存的数据库，凭借优秀的并发和易用性打下了互联网项的半壁江山。Redis 之所以高性能是因为它的纯内存访问特性，而这也成了它致命的弱点 —— 内存的成本太高。所以在绝大多数场合，它比较适合用来做缓存，长期不被访问的冷数据
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