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How do I know if the cardinality estimates in a plan are accurate? (Oracle Optimizer)

How do I know if the cardinality estimates in a plan are accurate? (Oracle Optimizer).

Further reading :
http://kerryosborne.oracle-guy.com/2010/02/gather_plan_statistics/
http://jonathanlewis.wordpress.com/2006/11/09/dbms_xplan-in-10g/

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