优化器的行为受三个关键因素的影响：Informix配置文件中OPTCOMPIND参数的值、查询命令和内部统计数据的准确性。

The behavior of the optimizer is influenced by three key factors: the value of OPTCOMPIND parameter in the Informix configuration file, query directives, and the accuracy of internal statistics.

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控制各种不同的行为参数，比如可以设置同时传输的文件的个数。

Control various behavioral parameters, such as how many simultaneous file transfers to allow.

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