Here are a couple of links to notes on interpreting Explain Plans :
http://www.akadia.com/services/ora_interpreting_explain_plan.html
and
http://jonathanlewis.wordpress.com/2007/02/01/execution-order
http://www.akadia.com/services/ora_interpreting_explain_plan.html
and
http://jonathanlewis.wordpress.com/2007/02/01/execution-order
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