mysql的数据字典

information_schema

performance_schema

 

 

mysql8 改了一下

 

mysql 8小时问题

https://www.jianshu.com/p/69dcae4454b3

https://www.cnblogs.com/zhoading/p/11597622.html

 

set global wait_timeout=31536000
set global interactive_timeout=31536000

set session wait_timeout=31536000
set session interactive_timeout=31536000