Denis Perchine <dyp(at)perchine(dot)com> writes:
> If I will assume that oid == int4 I will have 4 * 2 + 4 (size of
> vl_len in bytea) = 12. Plus 36 bytes of header (as noted in FAQ). It
> will be 48 bytes... But I still get error that tuple is out too
> big... And that my size is 8188, but should be 8140.
> It would be great if someone will clarify the way I should do such
> calculations.
You forgot the per-page overhead.
Offhand 36 seems too small for the per-tuple overhead, anyway, but I'm
too lazy to count bytes in include/access/htup.h right now...
regards, tom lane