Client applications can query a DAS and get a data graph in response, modify the data graph and send the updated data graph to a DAS to have the changes applied to the original data source.
Create a Relational DAS instance: an important aspect of creating the Relational DAS is describing the database schema it should use.
创建一个关系型DAS实例：创建关系型DAS的一个重要方面是描述它应使用的数据库架构。
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The DAS user ID and password can be different on all participating machines; however, you might want to keep the DAS user ID and password the same for simple configuration and maintenance.
DAS 用户 ID 和密码在所有参与机器上可以各不相同；但是，为了简化配置和维护，可能需要使 DAS 用户 ID 和密码一致。