The second part to component level error handling is to do appropriate logging.

组件层出错处理的第二个部分就是要做适当的日志。

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The system level error includes syntactical error, null pointer exception, web service timeout, database connection timeout, and so on.

系统级错误包括语法错误、空指针异常、web服务超时、数据库连接超时等。

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Identify auditing requirements, as well as technical and business-level error handling requirements and design services accordingly.

识别审计要求以及技术和业务级错误处理要求，相应地设计服务。

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Simplifications allow a permissible level of error to enter into the model in the hopes of making the it simple enough to run quickly, the concept understandable, and the results readable.

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But against that possibility investors should balance the fact that they stand a better than 50% chance of having 20-30% more money even at the highest level of tracking error.

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"We know at this level the difference is error and until we cut them out in our game, that's going to be difficult to get results, " Rees said.

BBC: Captain Matthew Rees urges Wales to cut out mistakes