Heterogeneous data sources的意思|示意

As mentioned, the focus of SDO is on providing a flexible data object representation for data from heterogeneous data sources and built-in support for optimistic concurrency.

刚才已提到，SDO的重点是为异构数据源中数据提供一个灵活的数据对象表示，并为开放式并发提供内置支持。

A federated system is created by installing Information Integrator on a DB2 UDB engine and configuring it to register one or more heterogeneous data sources.

联邦系统的创建方式是，在DB 2 udb引擎上安装Information Integrator，然后对其进行配置以注册一个或多个异构数据源。

Some examples of common middle tiers include application servers (for hosting applications) and federation servers (for transparent access to heterogeneous data sources).

通用中间层的一些示例有：应用服务器(用于包含应用程序)、联合服务器(用于透明地访问异构数据源)。

There exist both schema and context heterogeneity between distributed, heterogeneous data sources.

在分布异构的数据源之间不仅存在模式异构，而且存在上下文异构。

The information integration of IT systems in power plants involves many heterogeneous data sources, and has the demand for real-time information query.

文章认为发电厂IT系统的信息集成涉及许多异构的数据源，并且有不同程度的实时信息查询的需求。

Describe techniques for extracting from heterogeneous data sources.

简述异构数据源中的数据抽取技术。