I think it depends on if you are using UTF8 or not. There is a migration package for the database to move to UTF-8. If you are already on the target encoding then you might be able to skip that step. Otherwise, check if the latest migration package works with your version of v21. Your support contact might have more info. V21.0.10 HF2 is good, I haven't tried the later ones. I'd recommend waiting for v24.3 due in a week or so as 24.2 has a few UI bugs.