| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Cc: | Gavin Sherry <swm(at)linuxworld(dot)com(dot)au>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>, Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Subject: | Re: Minimally avoiding Transaction Wraparound in VLDBs |
| Date: | 2005-09-01 04:16:49 |
| Message-ID: | 200508312116.49401.josh@agliodbs.com |
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| Lists: | pgsql-hackers |
Gavin, Tom,
> Well, from my reading of some of the early papers, VACUUM was kind of
> different to what it is now. The idea was that expired data would be moved
> out the heap and stored else where. A timetravel mechanism could be used
> to see previous versions of the row.
And from talking to a couple of Stonebraker's former students at conferences,
this mechanism was never build satisfactorily; it always existed on paper, at
least at UCB. Illustra might have finished it. Elein around?
--
Josh Berkus
Aglio Database Solutions
San Francisco
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