Sometimes it’s the little things that catch you out (perhaps only briefly) on an upgrade. Here’s one that came up on Oracle’s Groundbreakers Developers Community [sic] (who knows what it will be called this time next year and, while we’re at it, who can tell where the apostrophe(s) ought to go).
The problem was with a database trigger that had been doing home-grown auditing to catch any DDL changes to non-SYS objects. The code was quite simple: