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carlintheclouds.hashnode.dev
If you’ve ever launched a WordPress site, or know someone that has, there is a level of difficulty associated with getting it up and running. However,…
monishbhanushali.github.io
Step 1: Create 2 EC2 instances Step 2: Install Mysql on both Instances. Check the installation by running below commands mysql --version sudo servic…
edwardchu.hashnode.dev
场景: 有一张财务流水表,未分库分表,目前的数据量为955万+,分页查询使用到了limit,优化之前的查询耗时 16 s 912 ms (execution: 16 s 805 ms, fetching: 107 ms),按照下文的方式调整SQL后,耗时 332 ms (execution: 158 ms, fetching: 174 ms); 操作: 查询条件放到子查询中,子查询只查主键ID,然后使用子查询中确定的主键关联查询其他的属性字段; 原理: 减少回表操作,利…
MySQL is an Open Source Relational SQL database management system.