markdown 研究案例：“InnoDB：数据库没有正常关闭！”

Posted 2021-05-05

The out-of-memory killer would choose mysql to close down, because it was (usually) the biggest memory user in the system.

The command to sort down processes by memory usage:
```js
ps aux --sort -rss | head -n15
```
Solution:
* Try upgrade new version
* Turn off optimize performance schema, edit ```/etc/mysql/my/cnf```
```js
[mysqld]
performance_schema=0
```