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over a period of having a lot of DML updates on your table a lot of insert updates and deletes so what happens is the indexes become invalid now to make them valid you need to rebuild the indexes in your test virtual machine you cannot actually test the performance of dropping and recreating the index or rebuilding the index you might say that okay the first one is cheaper but that doesnamp;#39;t work when it comes to scaled data or pretty big tables so when you have tables of terabyte size that point of time you canamp;#39;t just drop and recreate the index because that will cost lot of system resources and trust me itamp;#39;s not good in real time dropping and recreating index will be taxing on Oracle database itamp;#39;s not advisable but itamp;#39;s a good idea to rebuild the indexes when compared to dropping and recreating