elasticsearch为什么检索快? 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