The Process of Database Refactoring is a very comprehensive article on the issues, cases and do's and don'ts of database refactoring – i.e. schema changing… Scott Ambler is the author of
Both will be worth a read… make sure you order the book… I got the tip for this on Andrej's discussion about PL/SQL refactoring ...
here is the german amazon
Comments
Process of Database Refactoring
Scott is a prolific writer and has contributed much to the community. I have this book and one of his more recent books, A Practical Guide to Enterprise Architecture. Both are top notch.