当redis被用作缓存时，有时我们希望了解key的大小分布，或者想知道哪些key占的空间比较大。本文提供了几种方法。
一. bigKeys
这是redis-cli自带的一个命令。对整个redis进行扫描，寻找较大的key。例：
redis-cli -h b.redis -p 1959 --bigkeys
输出：
`prism-tokentokenjavascript
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 hash found so far ‘s_9329222’ with 3 fields
[00.00%] Biggest string found so far ‘url_http://mini.eastday.com/mobile/170722090206890.html?qid=sgllq&ch=east_sogou_push&pushid=13’ with 8 bytes
[00.00%] Biggest string found so far ‘foo’ with 40 bytes
[00.00%] Biggest hash found so far ‘s_9329084’ with 4 fields
[00.23%] Biggest zset found so far ‘region_hot_菏泽地’ with 625 members
[00.23%] Biggest zset found so far ‘region_hot_葫芦岛’ with 914 members
[00.47%] Biggest string found so far ‘top_notice_list’ with 135193 bytes
[00.73%] Biggest zset found so far ‘region_hot_自贡’ with 2092 members
[01.90%] Biggest hash found so far ‘uno_facet_2018-12-20’ with 59 fields
[11.87%] Biggest zset found so far ‘region_hot_上海’ with 2233 members
[27.05%] Biggest set found so far ‘blacklist_set_key’ with 31832 members
[73.87%] Biggest string found so far ‘PUSH_NEWS’ with 3104237 bytes
[86.18%] Biggest zset found so far ‘region_hot_北京’ with 2688 members
Original: https://www.cnblogs.com/wangcp-2014/p/15702410.html
Author: 飘飘雪
Title: 分析redis key大小的几种方法
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