You would want to do this on situations where frequent backups are not possible, or to force changed pages off buffer pools before performing copy activities outside DB2.
在不需要进行频繁备份的情况下可以这么做，或者在DB2之外执行复制活动之前强制发生变更的页面离开缓冲池。
It reads entire files into its own buffer, makes the specified operations on that copy, and optionally writes the buffer to disk.
它将整个文件读入自己的缓冲区，对该副本执行指定的操作，并可选地将缓冲区写到磁盘。
From here, depending on architecture, a call is made to copy from the user buffer to a kernel buffer with zeroing (of unavailable bytes).
从此开始，根据构架，为执行从用户缓冲区到内核缓冲区的零拷贝(不可用字节)而进行一个调用。
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