| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Martin Devera <devik(at)cdi(dot)cz>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: WAL & SHM principles |
| Date: | 2001-03-07 16:22:58 |
| Message-ID: | 200103071622.LAA09905@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > The only problem is that we would no longer have control over which
> > pages made it to disk. The OS would perhaps write pages as we modified
> > them. Not sure how important that is.
>
> Unfortunately, this alone is a *fatal* objection. See nearby
> discussions about WAL behavior: we must be able to control the relative
> timing of WAL write/flush and data page writes.
Bummer.
--
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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