mysql重启出现 MySQL server PID file could not be found!

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

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

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

1.终端输入：ps aux | grep mysqld        查看所有mysql进程

2.杀掉所有进程：sudo killall -9 mysqld

3.如果mysqld换了PID，但依然存在

输入：sudo launchctl unload -w /Library/LaunchDaemons/com.oracle.oss.mysql.mysqld.plist

（可以先输入        /Library/LaunchDaemons/        查看  .plist文件的文件位置）