本文介绍: 随着时间流逝，redis内存逐步增大，需要对redis内存进行清理，发现问题，解决问题。
场景
随着时间流逝，redis内存逐步增大，需要对redis内存进行清理，发现问题，解决问题。
方案
bigkeys 命令用于识别在 Redis 数据库中占用最多内存的键。
对服务有一定开销，在使用系统低峰期操作。
redis-cli -c -h 127.0.0.1 -p 7021 --bigkeys输出结果
# Scanning the entire keyspace to find biggest 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%] Biggest string found so far '"xxx22"' with 172 bytes
[00.45%] Biggest hash found so far '"xx111"' with 1 fields
....
[06.72%] Biggest list found so far '"lizzList"' with 1 items
...
[39.70%] Biggest set found so far '"setlizz:20"' with 8 members
[50.22%] Biggest hash found so far '"hashlizz:123123"' with 2480 fields
[85.93%] Biggest string found so far '"string111:12321312"' with 445240 bytes
[95.07%] Biggest zset found so far '"lizzZset"' with 30 members
-------- summary -------
Sampled 32329 keys in the keyspace!
Total key length in bytes is 1496560 (avg len 46.29)
Biggest list found '"lizzList"' has 1 items
Biggest hash found '"hashlizz:123123"' has 2480 fields
Biggest string found '"string111:12321312"' has 445240 bytes
Biggest set found '"setlizz:20"' has 8 members
Biggest zset found '"lizzZset"' has 30 members
4 lists with 4 items (00.01% of keys, avg size 1.00)
329 hashs with 3956 fields (01.02% of keys, avg size 12.02)
31922 strings with 6028942 bytes (98.74% of keys, avg size 188.86)
0 streams with 0 entries (00.00% of keys, avg size 0.00)
16 sets with 27 members (00.05% of keys, avg size 1.69)
58 zsets with 237 members (00.18% of keys, avg size 4.09)结果说明
[95.07%] Biggest zset found so far '"lizzZset"' with 30 members- 表示当前在内存使用最大的键，不包括值内容
- 95.07% ：当前扫描进度
- zset ：键值类型为，包括zset、list、set、hash、string
- ‘”lizzZset”‘ ： 键名
- n members：队列键值有n成员
- n items：队列键值有n个成员
- n bytes ：字符串键值占用n个字节
- n fields ： 集合键有n个字段
Sampled 32329 keys in the keyspace!
Total key length in bytes is 1496560 (avg len 46.29)- 对键空间采样，共检查了 32329 个键。
- 键的总长度为 1496560 字节，平均长度为 46.29 字节。
Biggest list found '"lizzList"' has 1 items
Biggest hash found '"hashlizz:123123"' has 2480 fields
Biggest string found '"string111:12321312"' has 445240 bytes
Biggest set found '"setlizz:20"' has 8 members
Biggest zset found '"lizzZset"' has 30 members- 每个数据类型的最大占用健
31922 strings with 6028942 bytes (98.74% of keys, avg size 188.86)
- 31922 个String类型的健，总的内存空间为6028942个字节，健数量的占比为98.74%，健值大小平均为188.86bytes。
- 其他类型。
原文地址:https://blog.csdn.net/lizz861109/article/details/135977585
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