The first article is very clear.
http://www.evolt.org/article/Use_Oracle_s_Explain_Plan_to_Tune_Your_Queries/17/2986/
http://www.oracle-base.com/articles/10g/PerformanceTuningEnhancements10g.php#cpu_costing
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/ex_plan.htm
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