New Optimizer Feature with 11g 1) Invisible indexes With 11g release,index can be made invisible. They will be maintained all the time and can be made visible any time alter index K invisible; Optimizer will not use the index if it is invisible alter index K visible If want one query to use invisible index,we can set this parameter in the session optimizer_use_invisible_index=true Then the … Continue reading New Optimizer Feature with 11g and 12c »