Peter Wilson <petew@yellowhawk.co.uk> writes:
> Partly the question might be 'what does the error message mean?' - it
> almost looks like do_restore doesn't think it has a real file underneath
> it, instead something that only provides sequential access.
That is certainly what the code thinks; as to what is actually going on,
it's pretty hard to guess without a test case to trace through. Is there
any chance you could cut your data down to something reasonable to
provide a copy of the dump file?
regards, tom lane