The db2 trace facility is controlled by means of the db2trc command, which is used to start and stop a trace, and to format captured trace information.

db 2跟踪功能是通过db 2 trc命令的方式来控制的，可以用该命令来启动和停止跟踪，以及格式化捕捉到的跟踪信息。

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Moreover, the processing of ores introduced poorly controlled changes in the concentrations of minor and trace elements in the resulting metal.

此外，对矿石的加工过程也在随之而形成的金属中引入了某些有失控制的次要和微量元素含量的变化。

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Based on the curve theory in differential geometry, we introduce for general control systems the concepts of shape variable, the controlled shape-trace curve and the shape congruence control.

针对一般控制系统，利用微分几何中的曲线理论提出了形状变量、被控形状轨迹曲线和形状合同控制等概念。

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Mr Vine said the agency had failed to routinely or consistently make security checks to try to trace some of the unresolved cases that had been subsequently placed in the "controlled archive", a list of people UKBA officials believed they could not trace.

BBC: UKBA attacked over 'inaccurate' data given to MPs

"I also found that no thorough comparison of data from controlled archive cases was undertaken with other government departments or financial institutions in order to trace applicants until April 2012, " he said.

BBC: UKBA attacked over 'inaccurate' data given to MPs

The MPs said the failure to trace these other migrants, whose cases were placed in a closed "controlled archive", led officials to conclude that they were not in the UK when in fact tens of thousands of them could be.

BBC: Border agency condemned over backlog