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obsidian-sync/日常学习/中间件/redis/小对象压缩ziplist.md

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Redis的ziplist是一个紧凑的字节数组结构，每个元素之间都是紧挨着。 !Snipaste_2023-02-24_14-42-21 1.png

  • 如果存储的是hash结构，那么key和value会作为两个entry被相邻存储
  • 如果是zset，value和score会作为两个entry被相邻存储
  • 如果set里存储的是字符串，那么sadd会升级为hashtable结构（HashSet）

存储界限

当集合对象的元素不断增加，或者某个value值过大，这种小对象存储也会被升级为标准结构

序号 规则
1 hash的元素个数超过512
2 hash的任意元素的key/value的长度超过64
3 list 的元素个数超过512
4 list的任意元素的长度超过64
5 zset 的元素个数超过128
6 zset的任意元素的长度超过64
7 set 的整数元素个数超过512