My point is that by introducing constraints on System i, you're not onlyThe key word is potentially, of course. A lot of that depends on your use of SQL; you will not enhance the performance of native I/O by adding constraints. As Rob's numbers show (and mine even moreso), constraints really hog the machine. Rob's indicate that UNIQUE doesn't hurt at all, but my guess is that it will.
enhancing database data integrity, you're potentially IMPROVING the
performance of your application(s). I've seen this scenario played out more than once (the ever elusive "magical