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Hi Dieter,
Thanks for your response and explanations.
One more quick question. When we say I/O..is it the number of records it is processing. for Example when i say select * from order_header where customer_number = 12345 where customer_number neither PI nor any index. then Numofresultsrow will be 1 but TotalIO count will 542334. What exactly this TotalIO Count mean here?
Thanks