The server quit without updating PID file (/usr/local/MySQL/data/ xxxxx.pid) error.
mysql does not have read/write access to the data directory.

Mac：sudo chmod -R a+rwx /usr/local/mysql/data/
Linux：chown -R mysql:mysql /var/lib/mysql
Then Restart:sudo usr/local/mysql/support-files/mysql.server start

Done!

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