Christophe Pettus <xof@xxxxxxxxxxxx> writes: >> On May 13, 2024, at 11:26, Adrian Klaver <adrian.klaver@xxxxxxxxxxx> wrote: >> May not induce the error unless there are parallel workers involved. > Indeed. I'll see about pulling together a test case that forces that. Right. Once a backend process has loaded a zone file, it caches that in a hash table that it will never flush (which is arguably a bug for other reasons, since those files aren't really immutable, but that's how it behaves today). So you've got 0 chance of hitting this via repeat SET TIMEZONE in a single backend. regards, tom lane