| From: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
|---|---|
| To: | Gokulakannan Somasundaram <gokul007(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Fwd: Clarification about HOT |
| Date: | 2007-11-05 15:38:54 |
| Message-ID: | 472F390E.8040306@enterprisedb.com |
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| Lists: | pgsql-hackers |
Gokulakannan Somasundaram wrote:
> Thanks Heikki. To clarify, there won't be any redirect-line pointers in this
> implementation. That space is saved. We will have the index tuple point to
> the latest live tuple in the update chain. So no need for redirect-line
> pointers.
The redirected line pointers are there for a reason. The reason is to be
able to retail vacuum (= prune) a page without having to do a regular
vacuum, scanning all indexes.
If you lose that ability, the idea is dead in the water.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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