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Since communication of voluminous data between distinct databases will be more di cult than within a database, we nd two features related to the implementation of database models in a distributed system We nd messages being used to communicate among subsystems, and we nd replication of relations When a relation is replicated in two databases, the databases are synchronized by keeping those relations identical We can now speak of an identity connection between the copies of the replicated relations in the distributed databases If the only constraints between independent databases are formulated as identity connections, the management rules for distributed databases are simpli ed All other connections now are maintained within a database Most work (see Sec 13-2) on integrity of distributed databases is based on replication of relations Retrieval operations on replicated data can be performed locally, permitting rapid query processing If at all possible one database should be designated as the primary database; all updates are performed there and subsequently update messages are sent to the databases having identity connections If update responsibility cannot be assigned to one database, the message tra c required to maintain integrity increases greatly In some cases periodic switching of the primary responsibility is possible



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1 Install the eBay Toolbar, as described in 3 2 Sign in by clicking eBay, and then clicking eBay Sign In/Out Enter your User ID and

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An example occurs in a bank, where during business hours the primary databases are in the branch o ce After daily closing the correspondence of the local data with the central o ce data is veri ed, and primary responsibilty is given to the central site Overnight the central database can be rapidly updated with transactions which arrive from other banks at the central o ce Update messages are communicated to the branch o ces In the morning responsibility is switched to the branches after an integrity veri cation





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We note that the creation of database submodels implies the existence of an integrated database model, even though the data may not be integrated In a distributed database there may be a global schema based on the integrated database model to aid global queries The next section will apply to distributed as well as to centralized databases

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he focus of this book is writing SQL in Oracle, which is a relational database management system. This first chapter provides a brief introduction to relational database systems in general, followed by an introduction to the Oracle software environment. The main objective of this chapter is to help you find your way in the relational database jungle and to get acquainted with the most important database terminology. The first three sections discuss the main reasons for automating information systems using databases, what needs to be done to design and build relational database systems, and the various components of a relational database management system. The following sections go into more depth about the theoretical foundation of relational database management systems. This chapter also gives a brief overview of the Oracle software environment: the components of such an environment, the characteristics of those components, and what can you do with those components. The last section of this chapter introduces seven sample tables, which are used in the examples and exercises throughout this book to help you develop your SQL skills. In order to be able to formulate and execute the correct SQL statements, you ll need to understand the structures and relationships of these tables. This chapter does not cover any object-relational database features. 12 discusses the various Oracle features in that area.

Once the decisions have been made on which view models are to be included in a single database model, the integrated model can be constructed The database model will consist of relations of various types, and the connections between the relations The combination may look like a tree, like a number of trees (a forest), or like a network when displayed

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