It maintains the file descriptor state on the requested file descriptor set across system calls.

它跨系统调用在请求的文件描述符集上维护文件描述符状态。

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A statistics profile is registered or stored in the table descriptor and system catalogs when the command parameter "SET profile" is added to the RUNSTATS command.

当将命令参数“SET PROFILE”添加到RUNSTATS命令时，将在表描述符和系统目录中注册或存储统计信息配置文件。

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This system call returns a file descriptor.

这个系统调用返回一个文件描述符。

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