| From: | "Zeugswetter Andreas ADI SD" <ZeugswetterA(at)spardat(dot)at> |
|---|---|
| To: | "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "PostgreSQL-development" <pgsql-hackers(at)postgresql(dot)org>, "Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com> |
| Subject: | Re: HOT WIP Patch - version 1 |
| Date: | 2007-02-14 18:15:33 |
| Message-ID: | E1539E0ED7043848906A8FF995BDA57901C138C6@m0143.s-mxs.net |
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| Lists: | pgsql-hackers |
> But now that I think of it, how do we get the root tid of a
> tuple? I suppose we'd be back to having backpointers or
> scanning the whole page... I guess pointer-swinging it is, then.
During vacuum you see a root [stub] not recently dead. You follow
the chain to detect if you find a live tuple that can replace
the root. You replace the root. You replace the original with a stub
that points at the root and mark it recently dead (and HEAP_COPIED_BACK
aka Pavan). ... (see prev post)
No need for anyone but vacuum to find a root.
Andreas
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