构造一个合适的代价模型对查询计划的选择有着十分重要的影响。
Constructing an appropriate cost model has important effect on selecting a query plan.
同时给出了查询代价视图选择问题的代价模型和实视图选择的过程。
In the meantime, the cost model of the query cost view selection problem and the process of materialized views selection are presented.
针对各种交通信息的实时更新，提出了最优代价模型以实现真正的最优路径规划。
Considering the real-time traffic information updated, optimal cost model is proposed to realize the optimal route planning.
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