DOUG presentation: Why does optimizer hate my SQL?

I presented about Cost based optimizer explaining why some times CBO chose inefficient access plan, even though, there is an efficient plan in the search space. This entry is to post presentation slides and they can be downloaded from Why_optimizer_hates_my_sql

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Update: Updated presentation after Greg’s comments.
Update2: Further bug fixes in presentation and script.
Update3: Updates after Randolf’s comments.