redis查看某一个key的大小

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redis查看某一个key的大小

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

# Scanning the entire keyspace to find biggest keys as well as# average sizes per key type. You can use-i 0.1 to sleep 0.1sec

# per100SCAN commands (not usually needed).

[00.00%] Biggest hash found so far 's_9329222' with 3fields

[00.00%] Biggest string found so far 'url_.html?qid=sgllq&ch=east_sogou_push&pushid=13' with 8bytes

[00.00%] Biggest string found so far 'foo' with 40bytes

[00.00%] Biggest hash found so far 's_9329084' with 4fields

[00.23%] Biggest zset found so far 'region_hot_菏泽地' with 625members

[00.23%] Biggest zset found so far 'region_hot_葫芦岛' with 914members

[00.47%] Biggest string found so far 'top_notice_list' with 135193bytes

[00.73%] Biggest zset found so far 'region_hot_自贡' with 2092members

[01.90%] Biggest hash found so far 'uno_facet_2018-12-20' with 59fields

[11.87%] Big