rob@xxxxxxxxx wrote:
So basically I don't see the performance hit when using DDL over DDS. Am I wrong?
No, you're right, Rob, except in one specifc case: a non-UNIQUE keyed physical far outperforms all other keyed approaches, including UNIQUE keys, NON-UNIQUE indexes or even non-UNIQUE logicals. It's a very narrow issue, but then again, for those tables that only have one key, it's enough to make you take a look at it.

Now, given the rule that most files are read rather than written, it's still probably moot, but let's take something like a log file that is only written to and whose primary key is just timestamp; that file might make sense to leave as a DDS keyed physical.


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