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MySQL不香吗,为啥还要Elasticsearch?_江苏省徐州市新沂市第值支做施工材料有限公司

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MySQL不香吗,为啥还要Elasticsearch?

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在技术面试中,遇到过这样一个有意思的场景,且听我娓娓道来。

面试官:“在你的系统里,都做过哪些性能优化,可以讲讲吗?” 候选人:“有些数据库查询检索类操作,我们用MySQL数据库会比较慢,所以全部挪到ElasticSearch(简称ES)中去做了,性能马上就提升了挺多。

” 面试官:“为什么挪到ES里面性能就提升了,可以从技术原理上讲一讲吗?” 候选人:“因为ES用的是倒排索引啊,而MySQL用的是B+ Tree索引,前者的性能要快很多…。

MySQL不香吗,为啥还要Elasticsearch?
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