Thanks for the reply. Yes we would be packing and backing up each day,
so changes made to the db wouldn't be that much of an issue. I guess
the best way to do this is to just test using various file types and
record the changes to the ZODB.

On Dec 5, 2007 12:06 PM, Raphael Ritz <[EMAIL PROTECTED]> wrote:
>
> michael nt milne wrote:
> > Hi
> >
> > Is there any documentation anywhere or advice on being able to estimate
> > the size of a potential Zope ZODB instance based on the size of a
> > current site? For example if you were to have a site of say 5 gb
> > consisting of HTML pages, graphics, images, pdfs, word docs, excel files
> > etc : are there any pointers anywhere on roughly how many gigs of ZODB
> > this would take up? Obviously word, excel and other binary formats will
> > likely translate to more weight...
> >
> > Also are there any ZODB growth prediction charts at all?
> >
>
> There is no general answer to this question other than "it depends" ;-)
>
> In addition to the raw amount of data that you listed the most
> important additional piece of information you didn't provide
> is how busy people will be changing things.
>
> As any change or edit to an object causes this object to be written
> to the ZODB again your ZODB can grow (almost) arbitrarily fast until
> you pack it again. As packing removes the history (up to a point) it
> is again a policy decision on your side how much history you want
> or need to keep.
>
> With regard to the overhead added by having a file live in the ZODB
> versus being on the file system I think you shouldn't even worry.
> For a first estimate this difference shouldn't matter.
> There are exceptions, of course, like when you add Archetypes to
> the picture as AT tends to add a lot of overhead but that's not
> really a ZODB issue.
>
> Just my 2 cents.
>
> Raphael
>
>
> > --
> > michael
> >
> >
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-- 
michael
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