Enables or disables query plan tracing, also known as a plan tree, which captures the transformation process of a query.

启用或禁用查询规划跟踪，也称为规划树，它捕获一个查询的转换流程。

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The theory and practice of realizing the plan progress control of basic construction process and tracing management with computer technology were introduced.

介绍了应用计算机技术实现基本建设过程计划进度控制和跟踪管理的理论及实践。

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An optimal method based on the back-tracing algorithm is presented for calculating the entire system restoration plan.

针对主从递阶决策问题的优化求解，提出基于回溯算法的优化方法。

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Mr Taylor also said "homecomers" enjoyed a richer experience if local people, museums and businesses have knowledge about the process of tracing family trees and were able to plan how to meet the needs of visitors.

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He said federal laws don't require the tracking and tracing of medicines, though companies are developing a plan, and California has a law that starts taking effect for manufacturers in 2015 .

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