this helps a little bit! Thanks! The backup was created, but I received the message that there are some problems. For more information see the file attached.
Have you tried to restart mysql after mysql_upgrade? It is required in this case.
It seems Plesk db has some broken references. Could you please run following commands (after restart mysql):
Code:
plesk db "UPDATE domains SET displayName = name WHERE displayName IS NULL OR displayName = '';"
plesk bin repair --db
The first fixes inconsistency between name and displayName in psa.domains tablse. The second one checks Plesk DB for a lot of other inconsistencies and tries to fix them in interactive mode.