Error: MySQL shutdown unexpectedly

解决：删除一系列文件，然后重新启动

Open your folder "\xampp\mysql\data"
Delete the file "multi-master.info"
Delete all files beginning with "master-"
Delete all files beginning with "mysql_relay-bin-"
Delete all files beginning with "relay-log-"
Delete all files beginning with "ib_logfile"
Delete all files beginning with "aria_log."

参考资料

https://community.apachefriends.org/f/viewtopic.php?t=81626&p=275342