Performance problem with references

[Christoph Kiehl]

Hi,

I'm experiencing an extreme performance/storage problem with references. In my 
case I got node(document) that reference another node(state) by reference. This 
state node is referenced by about 100.000 document nodes (still growing to about 
1.000.000). As NodeReferences get persisted on every change, there is a lot of 
data written to the database on each added reference.
What is the best way to handle this number of references? Is there a better way 
than saving the state uuid as string property an hence give up referencial 
integrity?

Cheers,
Christoph