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in a session we are going to discuss what are the difference between unusable indexes and invisible indexes with respect to Oracle 12c first coming to unusable indexes none useable index is ignored by the optimizer and is not maintained by DML means when insert update delete happens unusable index is not considered by optimizer and also statistics are not maintained coming to invisible index an invisible index is maintained during DML statements may be optimizer will ignore but the statistics are all maintained for invisible indexes for the DML statement so unusable index means it is ignored by the optimizer and not maintained by DML statements invisible index means it is maintained during DML statements let us see what is a statement you can make an index to unusable you can say alter index index name and unusable similarly for invisible index alter index custody invisible so for unusable index you have to use unusable keeper for invisible index you have to use invisible keywo