select version()
查找数据文件存放路径
show global variables like "%datadir%"
services.msc打开服务可重启mysql
mysql提示got timeout reading communication packets的解决方法
show GLOBAL variables like '%timeout%'
set global interactive_timeout=400;
set global wait_timeout=400;
show GLOBAL variables like '%log_warning%'
set global log_warning=1;