Re: Disabling Heap-Only Tuples

On Fri, 2023-07-07 at 16:27 +0530, Dilip Kumar wrote:
> On Fri, Jul 7, 2023 at 3:48 PM Tomas Vondra <tomas.vondra@enterprisedb.com> wrote:
> > I'm imagining either a table option with a couple possible values
> > (default, non-hot, first-page, ...) or maybe something even more
> > elaborate (perhaps even a callback?).
> > 
> > Now, it's not my intention to hijack this thread, but this discussion
> > reminds me one of the ideas from my "BRIN improvements" talk, about
> > maybe using BRIN indexes for routing. UPDATEs may be a major issue for
> > BRIN, making them gradually worse over time. If we could "tell"
> > RelationGetBufferForTuple() which buffers are more suitable (by looking
> > at an index, histogram or some approximate mapping), that might help.
> 
> IMHO that seems like the right direction for this feature to be
> useful.

Right, I agree.  A GUC/storage parameter like "update_strategy"
that is an enum (try-hot | first-page | ...).

To preserve BRIN indexes or CLUSTERed tables, there could be an additional
"insert_strategy", but that would somehow have to be tied to a certain
index.  I think that is out of scope for this effort.

Yours,
Laurenz Albe