Hello,
I would use CoreData in order to mantain an archive of objects: each object 
contains an attribute called "uuid"; in the same db only one object can have 
the same attribute value. This mean I should validate the proposed new object 
to insert and check if the another object with the same uuid is inside the 
storage. I've implemented it with a fetch request but it's so slow when there 
are lots of objects to insert (my db contains around 30,000 objects).
Any idea to improve performance of this check? Can CoreData support unique 
attributes as like key in sql database?
Thanks
mmc_______________________________________________

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