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redis缓存
2022-07-04 20:18:00 【每日一悟】
redis作为缓存：
缓存不是全量数，缓存应该随着访问变化
LFU：碰了多少次
LRU：多久没碰
key的有效期：不会随着访问延长
EXPIRE k1 50
设置过期时间
key的有效期：发生写，会剔除过期时间
过期判定原理：
（1）被动访问时判定
（2）周期轮训判定（增量）
稍微牺牲下内存，保住redis的性能
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