【摘要】 Panorama可以给用户提供一个公共数据模型和一种全局查询语言PanoSQL ,通过它们将不同的数据库集成到系统中 .该系统的主要构件包括 :集成到Panorama中的局部DBMs的接口、一个事务管理器、一个公共数据模型、一个模式集成器、一种全局查询语言、一个全局查询处理和优化器 .讨论该系统的体系结构和组成 ,然后讨论该系统中的模式集成器 ,并讨论了系统的查询语言和查询处理更多还原

【Abstract】 Panorama is a multidatabase system developed in HUST. The project aims to achieve interoperability among existing, heterogeneous, federated database management systems such as Oracle8, Sybase, and DM2. This system is based on OMG′s distributed object management architecture and it is implemented on top of CORBA compliant, namely VisiBroler, which is used as its infrastructure. In this paper, the architecture components of Panorama system and the schema integration in this system are discussed. The query language and the query processing developed for this system are extended.更多还原