Data changes flow in one direction, from the online processing server to the staging and reporting servers. 数据更改沿从在线处理服务器到临时服务器和报告服务器一个方向流动。
The data required at the batch processing server might be a subset of the data available at the online processing server. 批处理服务器所需的数据可能是联机处理服务器上可用数据的子集。
It typically means inserting a timestamp column in each database table used concurrently by both batch and on-line processing. 它通常意味着，在每个被批量和联机处理并发访问的数据库表中，增加一个时间戳列。
