How to build VORONOI diagram based on threaten locations, compute costs of flight routes, choose preliminary path and optimize path were discussed importantly.

重点讨论了如何根据威胁分布的VORONOI图建模，计算航路代价，航迹搜索和航迹优化。

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Even Better prefetch Paths: We made the prefetch path engine (eager loading) even smarter so it now knows more ways to optimize the queries it has to create.

更加优秀预取路径：我们设计了预取路径引擎(提前加载)更加智能以至于能通过更多的方法来优化它创建的查询。

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Without the FETCH FIRST (or similarly, but not exactly, without an OPTIMIZE FOR clause), then DB2 would almost certainly prefer some other access path.

没有FETCH FIRST(或者类似地，但是并不确切，是没有一个OPTIMIZE for子句)，那么DB 2毫无疑问会选择其他访问路径。

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