Calculating Percentage Gain/Improvement from Tuning

How do we calculate the percentage improvement from tuning? Even though not always true, LIO (Logical IO/Buffer Gets) is an approximate measure of the work needed for a SQL. For example, if the LIO before tuning was 1 million, and after tuning it came down to 150K,  the percentage gain can be calculated as given below:

 % Improvement = (Work Eliminated/ Original Work) * 100

Original work – 1,000,000 block reads

Work after tuning – 150,000 block reads

Work eliminated = 1,000,000 – 150,000 = 850, 000

% improvement =(850, 000/1,000,000) * 100 = 85

LIO may not be the correct metric in all situations–especially for DMLs. But the formula can be applied for the metric(elapsed time, CPU etc.)  you wanted to use.

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