Which guideline should be followed when beginning your tuning efforts?

A.
Look for the symptoms of the problem rather than just treating the probable cause.

B.
Start at low level and advance into broader areas based on discovery rather than intuition.

C.
Concentrate on the 10 to 20 percent of data with the highest queue and access rate.

D.
The larger percentage of the total system workload holds the key for tuning a system for
optimal performance.