I have a table containing about 2 million rows. I need to delete about a million of them based on simple criteria, say column x = 1. But I am worry about Oracle's RBS may grow so big that it can't handle it. What is the best way to delete rows in this case? If I have to allocate a big RBS for this purpose, how do I tell it to keep before-image of the deletion in this particular RBS? Or there is a better way to achieve this?