"Sorin N. Ciolofan" <ciolofan@ics.forth.gr> writes:
> It seems that the legacy application creates tables dynamically and the
> number of the created tables depends on the size of the input of the
> application. For the specific input which generated that error I've
> estimated a number of created tables of about 4000.
> Could be this the problem?
If you have transactions that touch many of them within one transaction,
then yup, you could be out of locktable space. Try increasing
max_locks_per_transaction.
regards, tom lane