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Traditionally, query optimizers depend on information available at optimization time such as statistics, cost parameters, predicate values, and resource availability in order to perform query transformations and optimization. The final plan, referred to as a static plan, for a request is chosen by computing the cost of each possible plan variation and selecting the least costly plan. During this process, the optimizer assumes that all the information is accurate and generates the plan for the entire request (a request can consist of multiple statements/queries).