AW: AW: How to check integrity of database?

I don't know the internal structures of FSFS, but what happens if FSFS returns buggy data? Is svn verify checking that the data is correct or does it trust on FSFS to never return buggy data (i. e. data that looks correct but actually is screwed: e. g. the original source line would be
 
"class x"
 
but FSFS returns
 
"class y"
 
because of internal mislinked pages.
 
Can this happen in FSFS and if it happens, does svn verify detect it?
 
I think now it's clear what I want to check for?
 
 
 
Mit freundlichem Gruss / With kind regards
Markus KARG, Staatl. gepr. Inf.
Entwicklung / R & D
QUIPSY QUALITY GmbH

________________________________

Von: Gary Thomas [mailto:gary@mlbassoc.com]
Gesendet: Mi 05.10.2005 14:55
An: Markus Karg
Cc: SVN Discussion
Betreff: Re: AW: How to check integrity of database?

On Wed, 2005-10-05 at 14:46 +0200, Markus Karg wrote:
> I just wanted to know whether this *is* a sufficient check, or not.
> I'm asking this because I have often seen database that worked well,
> but used broken or misleading links internally. This means, never an
> error appeared, but the data shown to the user was screwed. So the
> question is: Does svnadmin verify actually test the FSFS integrity, or
> does it only read each file? If it does the first, I am happy. If it
> does the last, it will not find misleading links. That's why I asked
> for a special FSFS tool but not for a SVN tool. So is there a FSFS
> guru near to answer this?

It does check that every revision can be reconstructed (identical
to dumping the repository without saving the results). I don't see
that anything else is necessary.

>
>
>
> Mit freundlichem Gruss / With kind regards
> Markus KARG, Staatl. gepr. Inf.
> Entwicklung / R & D
> QUIPSY QUALITY GmbH
>
>
> ______________________________________________________________________
> Von: Gary Thomas [mailto:gary@mlbassoc.com]
> Gesendet: Mi 05.10.2005 14:42
> An: Markus Karg
> Cc: SVN Discussion
> Betreff: Re: How to check integrity of database?
>
>
>
> On Wed, 2005-10-05 at 14:38 +0200, Markus Karg wrote:
> > Some relational databases (also Microsoft VSS) come with their own
> > tools to check integrity of the logical database structure (e. g. it
> > might be a page is corrupted etc.). Is there such a tool for FSFS? I
> > mean, can FSFS be broken and how can I detect this as early as
> > possible so I can restore the latest backup before and major loss
> > occurs?
>
> Is this not sufficient?
>
> svnadmin help verify
> verify: usage: svnadmin verify REPOS_PATH
>
> Verifies the data stored in the repository.
>
> --
> ------------------------------------------------------------
> Gary Thomas | Consulting for the
> MLB Associates | Embedded world
> ------------------------------------------------------------
>
>
>
>

--
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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