I think I understand where your coming from on this. The problems with making OO work with database applications are fairly well documented and have been the subject of a discussion here quite recently.

To be really useful (to me), the problems need to be fairly clearly defined, specific examples. Preferably with an indication of what problems where encountered in modelling them using an OO regime.

The OO/Database problem was summed up well by William Cook (paraphrasing, and I can't recall where I read it, perhaps quoted in one of Richard P. Gabriel's essays): The problem is that OO is about encapsulation of state and behavior but databases are about separating state and behavior.