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Hard RI is when we implement references ( say emp vs dept tables) where deptno is referenced in emp table to dept table explicitly. However, when we comment the code in DDL about this same referencing, then it becomes soft RI. So, the optimizer does the join elimination.
I am curious about the cost-effectiveness in terms of throughput and response time if I have hundreds of those queries. As per Fred's mail I see that batch soft RI is the best option for good throughput.
Thanks,
Raja