Liron Amitzi reported this on his blog a few days ago already. And it is a very nasty tiny little issue happening with RUs where the second number of the release enters the two-digit-space, such as 18.10.0. At this point, on Windows Only: Upgrade to Oracle 18.10.0 fails with ORA-01722. This happens late in the upgrade phase.
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What is the issue?
The problem here is a tiny little piece in %ORACLE_HOME\admin\catupstr.sql – a SUBSTR function is used in a way that it does not take into account a potential two-digit …
The 
