redis中keys匹配查询的效率问题

Submitted by shinian315 on 2014, November 6, 11:02 AM. redis

redis中的keys在很多时候能帮助我们完成模糊查询的功能，例如我们存储多个用户名的用户信息，我们可以这样向redis中写入：

set Uinfo:a:uid 1
set Uinfo:a:sex 1
set Uinfo:a:age 28

set Uinfo:b:uid 2
set Uinfo:b:sex 2
set Uinfo:b:age 18

这 样我们将用户a和b的UID，性别、年龄都写入到了内存中，当我们使用时可以使用keys Uinfo:*:uid得到匹配到的数组，含有2个结果：Uinfo:a:uid     Uinfo:b:uid   这样我们循环数组就可以得到a和b， 然后通过get Uinfo:a:age就可以得到对应的年龄，其它参数同理。

但是在项目中一定要根据实际情况来使用keys

之前我做了一个缓存项目，将站点的所有页面通过正则处理后缓存到内存中，多个正则规则都按照之前的方法存储到redis中，再通过keys构建数组进行循环匹配，刚开始redis中存储的记录数不多的时候系统还一切正常，但随着缓存的页面越来越多，redis-server对CPU的占用率越来越高，达到了百分之60多，眼瞅着系统越来越不稳定，才想到是keys导致的。

随后将处理机制改了一下，将匹配规则数组序列化后存到一个key中，这样读取的时候就直接用get即可，然后CPU的占用率直接就下降到百分之10以内。

所以keys以后使用时一定要考虑好系统将来的缓存总量。

Tags: redis, keys, 效率

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