[Zope-dev] multiple ZODB files?

[Jim Fulton]

Michel Pelletier wrote:
> 
> > -----Original Message-----
> > From: Anthony Baxter [mailto:anthony@interlink.com.au]
> > Sent: Thursday, January 06, 2000 2:27 AM
> > To: zope-dev@zope.org
> > Subject: [Zope-dev] multiple ZODB files?
> >
> >
> > Is it possible to set up a site such that as well as the single
> > Data.fs file, a seperate folder (say, /foo) is loaded from a different
> > ZODB file? In particular, changes to stuff inside /foo should
> > be written
> > to the foo ZODB file.
> 
> Not yet, we have not fully thought about this problem of multiple
> databases,

I'll add that we have thought quite a bit about it, just
not enough.  It's harder than one might at first expect.

> but ZODB was architected to be multi-DB aware.

Unfortunately, I suspect more architectural work 
will be needed too. :(


Some issues:

  - How to handle references accross databases.
    At a basic level, this is not too hard, but...

  - How to handle garbage collection in a multi-db environment.
    Oops.  Storages are currently responsible for GC.  This won't
    account for references from other databases.

  - How do databases get connected, from a UI point of view.
    Do you get to specify a database when you add an object?
    Any object?  Where do databases get defined?

    One idea I just thought of would be to have a databases
    area of the control panel where one could add database
    objects that modeled root database objects. Then, perhaps
    one would do the moral equivalent of a link from an object in
    one db to another.....

  - .... There are probably other issues I haven't thought of.

If anyone wants to work on this, I'd be willing to set up a mailing
list and provide advice. 

Jim


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