Hi, I have a 9i database and it has some MVs that go to a source database which is on 8i. This source database is planned to be upgraded from 8i to 9i. Do I need to drop and create the MVs with this upgrade. I would like to avoid a drop/create and I am thinking as long as refresh after the upgrade works : it is fine. Is a complete refresh needed? Any comments or experiences? Thanks for help.