如何快速检索？
https://www.infoq.cn/article/database-timestamp-02/?utm_source=infoq&utm_medium=related_content_link&utm_campaign=relatedContent_articles_clk
对比mysql
https://www.cnblogs.com/zxporz/p/11777190.html
算法中的O(1), O(n),O(logn), O(nlogn)
https://blog.csdn.net/Yanzudada/article/details/101679003
elasticsearch为什么检索快？
原文：https://www.cnblogs.com/tianboblog/p/12324070.html
