Sam Nelson <samn(at)consistentstate(dot)com> writes:
> pg_dump: Error message from server: ERROR: invalid memory alloc request
> size 18446744073709551613
> pg_dump: The command was: COPY public.foo (<columns>) TO stdout;
> That seems like an incredibly large memory allocation request - it shouldn't
> be possible for the table to really be that large, should it? Any idea what
> may be wrong if it's actually trying to allocate that much memory for a copy
> command?
What that looks like is data corruption; specifically, a bogus length
word for a variable-length field.
regards, tom lane