![Why would adding an index on a MySQL table slow it down significantly but ok on SQL Server and PostgreSQL - Database Administrators Stack Exchange Why would adding an index on a MySQL table slow it down significantly but ok on SQL Server and PostgreSQL - Database Administrators Stack Exchange](https://i.stack.imgur.com/DDG9D.png)
Why would adding an index on a MySQL table slow it down significantly but ok on SQL Server and PostgreSQL - Database Administrators Stack Exchange
![Query Timeout in MySQL Workbench | Error Code: 2013. Lost connection to MySQL server during query - Jeff Everhart Jeff Everhart Query Timeout in MySQL Workbench | Error Code: 2013. Lost connection to MySQL server during query - Jeff Everhart Jeff Everhart](https://b1334776.smushcdn.com/1334776/wp-content/uploads/2017/11/Screen-Shot-2017-11-04-at-2.03.49-PM.png?lossy=1&strip=1&webp=1)
Query Timeout in MySQL Workbench | Error Code: 2013. Lost connection to MySQL server during query - Jeff Everhart Jeff Everhart
MySQL Workbench:Error Code: 2013. Lost connection to MySQL server during query解决办法_HarryLi的博客-CSDN博客
![innodb - MySQL lost connection during query after specific record - Database Administrators Stack Exchange innodb - MySQL lost connection during query after specific record - Database Administrators Stack Exchange](https://i.stack.imgur.com/V5QsK.png)