参考：https://www.cnblogs.com/hxzkh/p/8473190.html(https://www.oschina.net/action/GoToLink?urlhttps%3A%2F%2Fwww.cnblogs.com%2Fhxzkh%2Fp%2F8473190.html)将该博主的某一部分摘录出来\lsdslam

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虽然现在使用哨兵主从的方式比较少了，但通过理解Redis哨兵，我们能获得更深入的分布式的知识。https://redis.io/topics/sentinel(https://www.oschina.net/action/GoToLink?urlhttps%3A%2F%2Fredis.io%2Ftopics%2Fsentinel)

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发现indexmerge局限性，优化器会自动判断是否使用indexmerge优化技术，查询还是需要组合索引【推荐阅读：对mysql使用索引的误解(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fwww.phpsong.com%2F2753.html)】MySQL单列索引

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