| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Patrick B <patrickbakerbr(at)gmail(dot)com>, pgsql-general <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: effective_io_concurrency increasing |
| Date: | 2017-06-19 22:30:03 |
| Message-ID: | CAH2-WzkPXxAFYi8CUZpNzZU6fX5UHSzeDWkm3aeazHESKqqKAA@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
On Mon, Jun 19, 2017 at 3:25 PM, Alvaro Herrera
<alvherre(at)2ndquadrant(dot)com> wrote:
> Surely you could prefetch all the heap pages pointed to by index items
> in the current leaf index page ...
I'm sure that you could do that too. I'm not sure how valuable each
prefetching optimization is.
I can imagine prefetching heap pages mattering a lot less for a
primary key index, where there is a strong preexisting correlation
between physical and logical order, while also mattering a lot more
than what I describe in other cases. I suppose that you need both.
--
Peter Geoghegan
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Andres Freund | 2017-06-19 23:35:51 | Re: effective_io_concurrency increasing |
| Previous Message | Alvaro Herrera | 2017-06-19 22:25:21 | Re: effective_io_concurrency increasing |