redis怎么判断热点数据_redis热点key解决方案

Redis 使用 hotkeys 查看热点数据

Redis 4.0.3中新增查看热点数据命令行，使用热点数据必须将内存策略修改为LFU算法

查看内存策略

dc-10:0>config get maxmemory-policy
 1)  "maxmemory-policy"
 2)  "noeviction"
 
 
 dc-10:0>object freq a
"ERR An LFU maxmemory policy is not selected, access frequency not tracked. Please note that when switching between policies at runtime LRU and LFU data will take some time to adjust."

设置内存策略为 LFU算法

dc-10:0>config set maxmemory-policy allkeys-lfu
"OK"

dc-10:0>object freq a
"0"

统计热点key

root@2690a5964c56:/# redis-cli --hotkeys

# Scanning the entire keyspace to find hot keys as well as
# average sizes per key type. You can use -i 0.1 to sleep 0.1 sec
# per 100 SCAN commands (not usually needed).

[00.00%] Hot key '"b"' found so far with counter 6
[00.00%] Hot key '"a"' found so far with counter 8

-------- summary -------

Sampled 2 keys in the keyspace!
hot key found with counter: 8   keyname: "a"
hot key found with counter: 6   keyname: "b"

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