解决MySQL is running but PID file could not be found

执行：sudo mysql.server status

报错：ERROR! MySQL is running but PID file could not be found

原因：mysql进程异常

解决办法：找到并kill掉所有关于mysql的进程

执行==>ps -ef | grep mysql 查看相关进程

执行==>kill 进程号

启动MySQL服务

    sudo /usr/local/mysql/support-files/mysql.server start

停止MySQL服务

    sudo /usr/local/mysql/support-files/mysql.server stop

重启MySQL服务

    sudo /usr/local/mysql/support-files/mysql.server restart