In the source code.

Paul Beach
Tel (UK):+44 (0) 1844 354465
E-mail: pabeach@...
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----- Original Message -----
From: Paul Klerlein <pklerlein@...>
To: <IB-Architect@egroups.com>
Sent: Thursday, September 28, 2000 4:22 PM
Subject: [IB-Architect] Re: Fixing a corrupt database


> Where can I find the page layout to try and patch the offending page.
>
> Paul.
>
> --- In IB-Architect@egroups.com, "Paul Beach" <pabeach@w...> wrote:
> > Paul,
> >
> > Just checking re. using gfix manually, a number of users forget
> that gfix
> > will run from the command line, and has a lot more options
> available to it,
> > than appear in the Server Manager, and that a "gfix" run from the
> Server
> > Manager will not do everything that gfix from the command line will
> do.
> >
> > If none of the utilities will work, including and especially gfix,
> you have
> > a major problem, as the only way that your database could get fixed
> would be
> > to patch the offending page - and there are no utilities to do
> this. It
> > would have to be done manually if it is fixable at all.
> >
> > From a checksum perspective, I believe the checksum mechanism was
> turned off
> > for performance reasons on Unix 4.0 ODS 8.0, and on all other
> platforms at
> > ODS 9.0 (4.2 ?)
> >
> > cf.
> >
> > 2. Checksum
> >
> > " If -ignore is specified, the checksum is specifically
> checked in
> > validate instead of in the engine. If the checksum is
> found to
> > be wrong, the error:
> >
> > "Checksum error on page xxx"
> >
> > is returned. This is harmless when found by validate, and
> the page
> > will still continue to be validated--if data structures
> can be
> > validated on page, they will be. If -mend is specified,
> the page
> > will be marked for write, so that when the page is written
> to disk
> > at the end of validation the checksum will automatically be
> > recalculated.
> >
> > Note: For 4.0 only Windows & NLM platforms keep page
> checksums."
> >
> > My concern is that the error is being returned by a page early on
> in the
> > database, and it is a page that is needed for a connection.
> >
> > As such it may be possible to fix your database, but it will take
> time and
> > effort.
> >
> > Regards
> > Paul
>
>
>
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