問題：
1.MySQL 無法start
$ sudo /usr/local/mysql/support-files/mysql.server restart
結果是
ERROR! MySQL server PID file could not be found!
Starting MySQL
...
ERROR! The server quit without updating PID file (/usr/local/mysql/data/Yende-MacBook-Pro.local.pid).
結果：
1.關機後，弄一弄...
2.突然又好了...
