| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | The Hermit Hacker <scrappy(at)hub(dot)org> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp>, PostgreSQL Development <pgsql-hackers(at)postgreSQL(dot)org> |
| Subject: | Re: ALTER TABLE DROP COLUMN |
| Date: | 2000-10-09 20:35:18 |
| Message-ID: | 200010092035.QAA01665@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
> On Mon, 9 Oct 2000, Tom Lane wrote:
>
> > The Hermit Hacker <scrappy(at)hub(dot)org> writes:
> > >> What happens if you crash partway through?
> >
> > > what happens if you crash partway through a vacuum?
> >
> > Nothing. Vacuum is crash-safe. ALTER TABLE should be too.
>
> Sorry, that's what I meant ... why should marking a column as 'deleted'
> and running a 'vacuum' to clean up the physical table be any less
> crash-safe?
It is not. The only downside is 2x disk space to make new versions of
the tuple.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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