| From: | Hannu Krosing <hannu(at)tm(dot)ee> |
|---|---|
| To: | Zeugswetter Andreas SB <ZeugswetterA(at)wien(dot)spardat(dot)at> |
| Cc: | "'Mikheev, Vadim'" <vmikheev(at)SECTORBASE(dot)COM>, "'Don Baccus'" <dhogaza(at)pacifier(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp>, Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, The Hermit Hacker <scrappy(at)hub(dot)org>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: AW: Plans for solving the VACUUM problem |
| Date: | 2001-05-28 09:11:46 |
| Message-ID: | 3B121652.C4DCE1F6@tm.ee |
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| Lists: | pgsql-hackers |
Zeugswetter Andreas SB wrote:
>
> > > You mean it is restored in session that is running the transaction ?
>
> Depends on what you mean with restored. It first reads the heap page,
> sees that it needs an older version and thus reads it from the "rollback segment".
So are whole pages stored in rollback segments or just the modified data
?
Storing whole pages could be very wasteful for tables with small records
that
are often modified.
---------------
Hannu
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