I have noticed that database changes on a live system are the hardest / most risky to implement. Also they are most likely to get to the heart of the problem. I

I have noticed that database changes on a live system are the hardest / most risky to implement. Also they are most likely to get to the heart of the problem. I learned what the article is talking about through experience - avoiding the "harder" changes and piling fix on top of other fixes until things become a mess.