Re: Question regarding the database page layout.

Hello Tom,

> Well, as Greg pointed out, setting t_hoff correctly should be sufficient
> for squeezing out useless padding between the tuple header and the tuple
> data. The real objection here is that that's leaving most of the
> possible gain still on the table. The tuple *as a whole* (header and
> data both) is still going to get maxaligned when it's plopped onto a
> disk page. I think that in real-world cases that's often where the
> main padding cost comes in: with 23-byte tuple headers and no OIDs,
> you aren't saving a thing by int-aligning t_hoff unless you have a nulls
> bitmap and it's the wrong number of bytes long.
>
> So IMHO the real problem is over near PageAddItem.

Thanks for your feed back as well. Between you and Greg I think I finally
understand the error in my thinking. I will investigate the PageAddItem()
later tonight.

- Ryan