"Zeugswetter Andreas DCP SD" <ZeugswetterA@spardat.at> writes:
> Why do we not truncate the line pointer array ?
> Is it, that vacuum (not the "full" version) does not move
> rows to other pages or slots ? Of course vacuum full could do it,
> but I see your point.
We can't reassign tuple TIDs safely except in vacuum full. It's
possible that a plain vacuum could safely truncate off unused line
pointers at the end of the array, but in the absence of a forcing
function to make those pointers become unused, I'm not sure it'd help
much.
regards, tom lane