它如何选择在优化存取路径中使用这些策略中的哪一个？
How does it choose which of these strategies to use in the optimized access paths?
您还需要学习如何最好地编写这些 SQL 语句以及如何发现 DB2 选择的存取路径来满足您的 SQL 请求。
You'll also need to learn how best to write these SQL statements, and how to discover the access paths DB2 chose to satisfy your SQL requests.
在计划优化模块中，详细讨论了存取路径的选择和代价评估的计算方法。
In plan optimization module, the access path selection and the account method of cost evaluation are discussed in detail.
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