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。