Slides from OOW13
The optimizer must try to be all things to all people, and similarly, the collection of optimizer statistics must try to satisfy the needs of all. And many DBA's just leave it at that. But the optimizer offers so much more than that. With a little more effort and discipline, we can achieve much more than a "one-size-fits-all" policy, and maximize the benefit of all of the optimizer features. We'll look at the tools now available under DBMS_STATS to get more stability and better performance with optimizer statistics.