Re: [HACKERS] Storing rows bigger than one block

Mattias Kregert wrote:
>
> Darren King wrote:
>
> > There is a var in the tuple header, t_chain, 6.2.1 that has since been
> > removed for 6.3. I think its original purpose was with time-travel,
> > _but_, if we go with a ROWID instead of an oid in the future, this could
> > be put back in the header and would be the actual address of the next
> > block in the chain.

No, this is not for time-travel. Look at implementation guide.

> >
> > Oracle has this concept of chained rows. It is how they implement all
> > of their LONG* types and also handle rows of normal types that are
> > larger than the block size.
>
> Yes! I can't see why PostgreSQL should not be able to store rows bigger
> than one block? I have seen people referring to this limitation every
> now and then, but I don't understand why it has to be that way?
> Is this something fundamental to PostgreSQL?
^^^^^^^^^^^
It seems that answeer is "No". Just - not implemented feature.
Personally, I would like multi-representation feature more than that.
And easy to implement.

Vadim