Parse overhead on Disabled constraints

What is the performance overhead (if any) on disabled constraints? My assumption is that Oracle will have to validate if a constraint is available and what the status is (ENABLED OR DISABLED). There should be a performance impact, with having
constraints in ENABLED state

         Vs 
        having constraints in DISABLED state 
         Vs 
        No constraints or constraints dropped.

Any ideas or stats on this subject.

Thanks

Murali Vallath Received on Wed Sep 06 2000 - 21:45:01 CDT