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DB Optimizer's SQL tuner will take a query and try to produce as many execution paths as possible. These alternative execution paths can then be run to see if there is a faster or less resource expensive execution path. The execution of each alternative case is timed and if the execution exceeds 1.5 X the original case then its execution is stopped and we move on to the next case. This avoids wasting time and resources on execution plans that are clearly sub-optimal.
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