场景SQL 的相关内容

问答 2022-02-15 来自：开发者社区

大家一般都什么业务场景下用sql啊？

转自钉钉群21789141：大家一般都什么业务场景下用sql啊？

文章 2022-02-14 来自：开发者社区

前言在应用开发的早期，数据量少，开发人员开发功能时更重视功能上的实现，随着生产数据的增长，很多SQL语句开始暴露出性能问题，对生产的影响也越来越大，有时可能这些有问题的SQL就是整个系统性能的瓶颈。如果有不同意见，欢迎留言指正，一起学习！SQL优化一般步骤1、通过慢查日志等定位那些执行效率较低的SQL语句2、explain 分析SQL的执行计划需要重点关注type、rows、filtered、e....

文章 2017-05-02 来自：开发者社区

优化案例 | 分区表场景下的SQL优化

一、导读有个表做了分区，每天一个分区。该表上有个查询，经常只查询表中某一天数据，但每次都几乎要扫描整个分区的所有数据，有什么办法进行优化吗？二、待优化场景有一个大表，每天产生的数据量约100万，所以就采用表分区方案，每天一个分区。下面是该表的DDL： CREATE TABLE `t1` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, ...

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