The method of moving database changes from the primary to the secondary system varies, but the process produces a window of time during which data has not migrated from one system to the other.

将数据库从主系统移动到辅助系统的方法因情况而异，但是这个过程总会产生一个时间窗，在这个时间窗内，数据还没有完成从一个系统到另一个系统的迁移。

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This is especially true for batch processing, where applications must process vast amounts of data within some narrowing window of time.

对于批处理来说，尤其如此，其中的应用程序必须在某个不断缩小的时间窗内处理大量的数据。

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There has to be some gap of clock cycles between the unblocking of signals and the next instruction carried by the process, and any occurrence of a signal in this window of time is lost.

从消除信号阻塞到进程执行下一个指令之间，必然会有时钟周期间隙，任何在此时间窗口发生的信号都会丢掉。

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