这也是客户收入优化和生命周期价值构造的重要组成部分。
It is also an essential part of customer revenue optimization and lifetime value building.
优化程序采用系统目录，说明那里有多少行，以及构造了较好的索引来计算所采用的查询路径。
The optimizer uses system catalogs indicating how many rows there are and how well the indexes are formed to figure out what query path to use.
并行性的难题和生成有效代码所需的优化不适合在单个的编译器构造的课程中讲。
The hard issues of parallelism and the optimizations needed to produce effective code just don't fit into the time available for a single course in compiler construction.
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