DB 2优化器是一款高度复杂的基于成本的优化器。

The DB2 optimizer is a highly sophisticated cost-based optimizer.

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将该组索引输入到基于成本的优化器，这个优化器决定是否使用任何合适的索引。

This set is input to the cost-based optimizer that decides whether to use any of the eligible indexes or not.

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该代数由基于成本的优化器使用，该优化器能够自由混合使用常规运算符以及与压缩有关的运算符。

This algebra is exploited by a cost-based optimizer that can freely mix regular and compression-aware operators.

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