> Instead of a partial row CRC, we could just as well use some other bit
> of identifying information, say the row OID. Given a block CRC on the
> heap page, we'll be pretty confident already that the heap page is OK,
> we just need to guard against the possibility that it's older than the
> index item. Checking that there is a valid tuple at the slot indicated
> by the index item, and that it has the right OID, should be a good
> enough (and cheap enough) test.
I would hardly call an additional 4 bytes for OID per index entry cheap.
Andreas