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 <r.ritz@biologie.hu-berlin.de> 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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_______________________________________________ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
-- michael