// Defaults:
Db4o.configure().activationDepth(5);
Db4o.configure().updateDepth(1);
Db4o.configure().objectClass(Person.class).cascadeOnActivate(false);
Db4o.configure().objectClass(Person.class).cascadeOnDelete(false);
Db4o.configure().objectClass(Person.class).cascadeOnUpdate(false);

// Vollständig manuelle Aktivierung mit Bug:
Db4o.configure().activationDepth(0);
...
Person p = (Person)q.execute().next();
db.activate(p, 1);
p.mother.age++;
db.store(p.mother);
db.deactivate(p, 1);