| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Heap WARM Tuples - Design Draft |
| Date: | 2016-08-04 17:21:26 |
| Message-ID: | 20160804172126.GP1702@momjian.us |
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| Lists: | pgsql-hackers |
On Thu, Aug 4, 2016 at 06:18:47PM +0100, Simon Riggs wrote:
> > Have you considered what it'd take to allow index pointers to allow to
> > point to "intermediate" root tuples? I.e. have some indexes point into
> > the middle of an update-chain, whereas others still point to the
> > beginning? There's certainly some complications involved with that, but
> > it'd also have the advantage in reducing the amount of rechecking that
> > needs to be done.
>
> "Intermediate root tuples" was my first attempt at this and it didn't
> work. I'll dig up the details, some problem in VACUUM, IIRC.
I think the problem is that HOT chain pruning becomes almost impossible
except via VACUUM.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
+ Ancient Roman grave inscription +
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