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  3. March 2008

Re: Which of the SYSIBM tables/views show the row count for

Elvis Budimlic wrote:
My point is that by introducing constraints on System i, you're not only
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
index").
The 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.

I guess my point is that the more we move into mixed-mode access and heavy use of SQL, the more we'll need a DBA position to help tweak the database. Because just leaving it to a blanket application of the most widely adopted practice of the day is almost certainly *not* going to give you the best results.

Joe

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