Re: Physical append-only tables

On Mon, Nov 14, 2016 at 3:39 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Magnus Hagander <magnus(at)hagander(dot)net> writes:
> > What I'm talking about is something that would be a lot simpler than
> > auto-clustering. I'm not even talking about trying to detect if the row
> was
> > about to go into the right place -- this might be expensive and certainly
> > more complicated. I'm only talking about a simple case where we *never*
> put
> > anything anywhere other than at the end of the table, period. That should
> > make the check both cheap and simple.
>
> It also makes it so much of a corner case that even a cheap check could be
> a net performance degradation, especially for people whose usage pattern
> doesn't match this.
>
>
I agree that it definitely solves just one problem. But it seems to be a
fairly common problem, particularly for users of BRIN users.

Full auto-clustering would cover many more usecases, but would also be a
lot more expensive to maintain.

--
Magnus Hagander
Me: http://www.hagander.net/
Work: http://www.redpill-linpro.com/