Upgrading to MySQL 8.0

MySQL 8 uses a global data dictionary containing information about database objects in transactional tables. In previous versions, the dictionary data was stored in metadata files and non-transactional system tables. You need to upgrade your data directory  from the file-based structure to the data-dictionary structure.

Just like a downgrade, you can upgrade using two methods:

• In-place upgrade
• Logical upgrade

You also should check a few prerequisites before the upgrade.