Comment out the code for tr_dps_block_dataset. As it is, on Oracle 12, it gives an
ORA-904 (invalid identifier) for 'bytes', three times. But it's not the 'bytes' that's
the problem, if I comment that out it complains about other things. Probably the
syntax has changed since the code was initially introduced, and now fails.

In any case, this trigger was never created in any of the Prod, Dev or Debug instances.