The data flow engine provides the in-memory buffers that move data from source to destination, and calls the sources that extract data from files and relational databases.

• 数据流任务封装数据流引擎。数据流引擎提供将数据从源移动到目标的内存中的缓冲区,并且调用从文件和关系数据库中提取数据的源。