On 2010 Feb 12, at 03:45, malcom wrote:

> Any idea to improve performance of this check?

Well, 30,000 uuid is only a megabyte or so.  I really hate to say this, but, 
just as a wild and crazy experiment, fetch the uuids from those 30,000 into a 
giant NSSet, and determine uniqueness by seeing if -member:aUUID returns 
non-nil.  Compare performance with your Core Data validation and let us know 
the results.

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