用于数据库的 I/O 服务器（预取器）的数目可以使用 NUM_IOSERVERS 数据库配置参数进行配置。

The number of I/O servers (prefetchers) for a database can be configured using the NUM_IOSERVERS database configuration parameter.

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这是通过映像内包含的 “激活代码” 实现的，它可以读取输入参数、将这些参数映射到不同的预配置的配置文件并进行重新配置。

This is accomplished through “activation code” included within the image that reads input parameters, maps these parameters to different pre-configured profiles, and performs reconfiguration.

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其构造函数含有两个参数：初始化属性和预配置的记录器(logger)实例。

Its constructor takes two arguments: initialization properties and a pre-configured logger instance. Properties object contains the following.

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