https://www.slideshare.net/StleDeraas/upgrading-to-my-sql-80
https://mysqlserverteam.com/mysql-8-0-16-mysql_upgrade-is-going-away/
https://mysqlserverteam.com/upgrading-to-mysql-8-0-here-is-what-you-need-to-know/
https://mysqlserverteam.com/inplace-upgrade-from-mysql-5-7-to-mysql-8-0/
https://mysqlserverteam.com/mysql-shell-8-0-4-introducing-upgrade-checker-utility/
http://lefred.be/content/how-to-safely-upgrade-to-mysql-8-0/
http://lefred.be/content/migrating-to-mysql-8-0-without-breaking-old-application/