ethan mindlace fremen wrote:
Dyon Balding wrote:
1) Longer term, Jim has talked about being able to use multiple storages simultaneously. This would allow you to set up one storage for your frequently changing stuff and one for your less frequently changing things.
yep. multiple storages are a solution to a number of problems at the moment. what is the current status of multiple storages?
I'm curious about it as well... obviously, something like it exists in the ZEO, but that's a little heavy for my needs
Actually, ZEO does not use multiple storages, it uses a single, client/server storage with a single storage server serving multiple storage clients. Of course, when (and I do mean when) multiple storages are supported then the storage server can also use multiple storages (including multiple client storages, I suppose, whew!). The status of multiple storages is that we're thinking really hard about it. There are a number of things to consider, many of them a ways over my head. Here is recent message from Jim that describes this: Jim Fulton wrote:
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
-- Jim Fulton mailto:jim@digicool.com Technical Director (888) 344-4332 Python Powered! Digital Creations http://www.digicool.com http://www.python.org
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