System statistics are like Yeti everybody has heard about them but (almost) nobody saw them (in action). This feature which is in place for quite a while influences execution plans and thus Oracle performance. Many DBAs say this kind of statistics are of little use but is it really the case?
If you havent calculated system statistics for your databases this presentation is for you you will see if they are really worthy of your attention. I will show how to calculate them and how CBO takes advantage of their existence.