The optimizer relies on statistics to properly cost alternative query execution plans (QEPs) and choose the most optimal plan.

优化器是依靠统计信息来计算可选查询执行计划（QEP）的开销，同时选择出最优的计划。

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A query plan ideally is an optimal plan to execute the given query - that is, it determines the most efficient way to fetch the data.

理想情况下，查询计划是执行给定查询的最佳计划—也就是说，它会确定抓取数据的最佳方式。

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The many complex factors and the dynamic nature of data means that an optimal plan evaluation is often a complex process indeed for any database system.

这么多复杂的因素，再加上数据本身的动态性，使得最佳计划的评估对于任何数据库系统而言通常都是一个复杂的过程。

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Determining the optimal incentive plan design will not only help improve performance, it will promote ethical behavior that is in the best interest of the company and shareholders.

FORBES: Creating Incentive Plans That Actually Incent Employees

Sustainability software can provide alerts if plans are made to purchase prohibited raw material, help report on safety related or environmental incidents, as well as plan optimal responses to those incidents.

FORBES: Four Steps to Improving Profits through Sustainability

And what the executive order I'm going to be signing today does is to create a 90-day plan that allows optimal coordination as we move forward, in addition to the coordination that we're doing with private sector companies and not-for-profits and other organizations out there that are interested in this issue.

WHITEHOUSE: Tackling Childhood Obesity