You could try generating data models and comparing those, but we don't really support Access in our Data Modeler.
I think you need to explain exactly what it is you want to compare first, then we can give advice. I would guess that our advice won't include using SQL Developer...
Is there possibiity to compare (by join) two databasis, one of them is in oracle (it's heavy and i don't have right to change anything in it, the second is in access)?
I don't understand the question.
You seem to be asking the question: can I compare an apple to an orange? Well, yes, but you shouldn't expect that it is going to match.
Those databases have different naming standards and different datatypes. So what type of comparison would be meaningful?
You need to provide an actual example of what you mean by 'compare'.