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Introduction to ObjectRelational Database （介绍ObjectRelational数据库）
Chapter 1 Introduction to Object-Relational Database Development Overview This book describes the Object-Relational Database Management Systems (ORDBMS) technology implemented in the INFORMIX Dynamic Server (IDS) product, and explains how to use it. This first chapter introduces the basic ideas behind object-relational, or extensible, DBMSs. It is intended as a road map to guide readers in their own exploration of the material. We begin with a little historical background explaining the moti- vation behind an ORDBMS product such as IDS. At this early stage of the book, it is enough to say that ORDBMS technology signifi- cantly changes the way you should think about using a database. In contrast with the more byte-oriented Relational DataBase Manage- ment System (RDBMS) technology, an object-relational database organizes the data and behavior of business objects within an abstract data model. Object-Relational query statements deal with objects personal name, part, code, polygon and video, instead of INTEGER, VARCHAR or DECIMAL data values. 1 The chapter continues with a high-level description of the features and functionality of IDS. We introduce the Object-Relational (OR) data model, type and function extensibility, storage manager extensibility, and active database features. Later chapters of the book address each topic in more detail. Moving along, we take a little time to examine how an ORDBMS is implemented internally. This digression is important because it provides a f
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