Thank you Werner for your response.

I'm going to try the stuff with lazy loading afterwards, here is the issue 
about db-locking:

On Saturday 29 May 2004 10.33, Werner Guttmann wrote:
> On Sat, 29 May 2004 00:17:15 +0200, Stefan Frank wrote:
> >Hello everybody
> >
(...)
> >
> >Well the next point is much more important. In the documentation is only
> >written that database-locking works with Oracle and Sybase. But it is
> > nowhere mentioned that it also works with PostgreSQL. But on the other
> > hand in the JDO-FAQ it is written, that PostgreSQL supports the main
> > functions of Castor.
>
> Can you please point me the exact place of this, and I will amend the docs
> accordingly.

JDO FAQ: 
<------------------------------------------------------------------------------------------------->
http://www.castor.org/jdo-faq.html#Which-Open-Source-database-is-supported-better%3F

Which Open Source database is supported better?
---------------------------------------------------------
For now only with PostgreSQL 7.1 and SAP DB you get a full set of Castor 
features. Other Open Source databases don't support select with write lock, 
so db-locked locking mode doesn't work properly (it works in the same way as 
exclusive locking mode). 


All other Castor features are supported with MySQL, Interbase, InstantDB and 
Hypersonic SQL. 
<------------------------------------------------------------------------------------------------->
If I understand the first paragraph correclty, PostgreSQL + Castor supports 
db-locking. Well, and thats true in a ceratin way: As I mentioned I can lock 
objects, that have no references to other objects. But if there are, and 
theres a null-Reference, it comes to the nullable OUTER JOIN in Postgre...

Maybe I misconfigured something?



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