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: | Kevin Brown <kevin(at)sysexperts(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Detecting corrupted pages earlier |
Date: | 2003-04-02 20:34:49 |
Message-ID: | 200304022034.h32KYnQ19987@candle.pha.pa.us |
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Lists: | pgsql-hackers |
Tom Lane wrote:
> Kevin Brown <kevin(at)sysexperts(dot)com> writes:
> > Tom Lane wrote:
> >> Basically, one should only turn this variable on after giving up on the
> >> possibility of getting any data out of the broken page itself. It would
> >> be folly to run with it turned on as a normal setting.
>
> > This statement should *definitely* go into the documentation for the
> > option, then...
>
> Andrew Sullivan expressed concern about this, too. The thing could
> be made a little more failsafe if we made it impossible to set
> ZERO_DAMAGED_PAGES to true in postgresql.conf, or by any means other
> than an actual SET command --- whose impact would then be limited to
> the current session. This is kind of an ugly wart on the GUC mechanism,
> but I think not difficult to do with an assign_hook (it just has to
> refuse non-interactive settings).
>
> Comments?
Perhaps better would be to throw a message message any time it is turned
on, reminding them it should not be left on. Is that cleaner?
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
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