I think there are heaps of reasons including the ones you mention.
But I think the main thing is that dev's might like the idea of a
clean object DB, but in practice, the data held by an organization
does not (or should not) match the objects used by a program.  And
this data shouldn't be tied to any one app.  And relational people
will argue that most enterprise data suits a relational model more
than an OO one.

Then there is the whole investment in DB technologies, admin, tuning,
reporting, backup, replication etc.

I don't know much about OO databases so I can't say how they compare.

On May 15, 6:12 am, Nico <[email protected]> wrote:
> I'd like to hear the posse discuss why technologies such 
> ashttp://www.db4o.com/
> has not yet taken over from the traditional Relational Databases like
> Oralce, SQL Server, MySQL..
>
> Is it because the technology is not mature enough or is it because of
> vested interest both political and monetary in large enterprises?
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