The real error is:
ORA-12801: error signaled in parallel query server P000 ORA-01115: IO error reading block from file (block # )
ORA-01115: IO error reading block from file 2 (block # 215616)
ORA-27072: File I/O error
Additional information: 4
Additional information: 215616
Additional information: 212992
The "solutions" you tried make no sense when you ...
Here is a query what will generate all the necessary update statements.
It temporarily disables foreign key checks so that the update statements succeed.
It updates the default character set for each database that needs it.
It updates the default character set of each table:
If it doesn't have the right default character set.
If it contains text columns ...
Upgrading your two 2017 instances to Enterprise is a simple process. SQL Server Setup has a function called Edition Upgrade, which is a fairly straightforward process.
Your SQL 2016 Standard to SQL 2017 Enterprise is more complicated. You need to assess your environment and determine what best suits your resources, skills and appetite for risk. Microsoft ...