Re: Some questions about your DB

[Falko Braeutigam <falko@smb-tec.com>]

Hi Alison,
sorry for the delay. I Cc: this to the mail list too.

On Tue, 31 Oct 2000, you wrote:
> Hi there,
> 
> We are considering using ozone for a software framework project. 
> We are comparing this database with some commercial ones.  We 
> would like to use ODMG3.  Could you please answer the following 
> questions (or refer us to anyone that might be able to):
All people who are able to answer such questions are reachable via the mail
lists.

> 
> * What ODMG 3 features are not supported?
ozone supports (implements) all interfaces of org.odmg (database
interface and collections, version 3.0) - except for the
Database.makePersistent() method, which is replaced by a createPersistent()
method. In contrast to ODMG database objects are always explicitely
created/deleted in ozone. Ozone provides classes/interfaces which support
porting from/to ozone/orther ODMG databases. Other ODMG 3.0 features like OQL
and property files are not supported.

> * How is garbage collection or compaction of the database handled?
No garbage collection, see above. Compaction is automatically handled.

> * What features are available to efficiently read or not read parts 
>   of objects that are referenced?
What do you mean by "read"? Ozone never transferes objects from the server to
the client. This is what we call a single instance architecture. Please read
the documentation available on the web site.

> 
> * How are changes to classes handled?
All the things that are supported by Java serialization in this regard are
supported by ozone. Ozone can handle only one version of the byte code of a
class at the same time but this byte code can handle data that is maybe
generated with another version of the class.

> 
> * Is both local and remote access supported?
Yes.

> 
> * What export/import facilities are available?
XML export is ready but not yet available in CVS. Import will follow.

> 
> * Will JDO be supported?
No.

> 
> Thanks a lot for your help!
Please keep us posted about your progress.


Falko
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______________________________________________________________________
Falko Braeutigam                              mailto:falko@smb-tec.com
SMB GmbH                                        http://www.smb-tec.com