Using STP algorithm, the least cost paths between nodes are computed when computing the working tree, so the best backup path can be found as soon as the failure occurs.

在组播树建立之初，计算好组播节点之间的最小代价路径，以便于出现故障之后寻找最优备用链路；

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Before SQL is executed, the DB2 optimizer estimates the cost of the candidate access paths and selects the path with the least estimated cost.

在执行SQL之前，DB 2优化器会评估候选访问路径的成本，然后选择成本最低的路径。

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So the most optimal path planning is regard as the problem of searching for roads which have the least cost in a road net.

所以，最优路径规划最终都可以归结为在特定的道路网络中搜索总代价最小的目标路径问题。

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