Let me repeat: you no longer have to run mysql_upgrade after updating the binaries.
From the release notes:
Previously, after installation of a new version of MySQL, the MySQL server automatically upgrades the data dictionary tables at the next startup, after which the DBA is expected to invoke mysql_upgrade manually to upgrade the system tables in the mysql schema, as well as objects in other schemas such as the sys schema and user schemas.
The server, starting 8.0.16, does the work previously done by mysql_upgrade for itself. And mysql_upgrade itself is deprecated.
I have had to help too many folks who either forgot to run mysql_upgrade after an upgrade or did not know they could not run it properly do to a lack of permissions from their unprivileged user account.
One Year of 8.0And speaking of MySQL 8.0, it has been out for OVER one year now. Woot!
Skip_grant_tablesAnother change to note concerns the much abused skip_grant_tables option.
Previously, if the grant tables were corrupted, the MySQL server wrote a message to the error log but continued as if the --skip-grant-tables option had been specified. This resulted in the server operating in an unexpected state unless --skip-grant-tables had in fact been specified. Now, the server stops after writing a message to the error log unless started with --skip-grant-tables.