Fundamentals of Database systems 3th edition PHẦN 10 pptx

... variable. 1 Page 796 of 893 Appendix D: An Overview of the Hierarchical Data Model (Fundamentals of Database Systems, Third Edition) D.1 Hierarchical Database Structures D.2 ... Applications PODS: Proceedings of the ACM Symposium on Principles of Database Systems SIGMOD: Proceedings of the ACM SIGMOD International Conference on Management of Data...

Ngày tải lên: 08/08/2014, 18:22

... the class of stratified programs. The bill -of- materials problem, in which the cost of a composite part is defined as being the sum of the costs of all atomic parts, is an example of a problem ... highlight the nature of the information that is discovered, the types of problems faced in databases, and potential applications. We also survey the state of the art of a large...

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... of Multiple Views of the Data A database typically has many users, each of whom may require a different perspective or view of the database. A view may be a subset of the database or it may ... another C++ program. The persistent storage of program objects and data structures is an important function of database systems. Traditional database systems often suffered...

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... be reserved for databases containing tens of terabytes. 5.1.2 Storage of Databases Databases typically store large amounts of data that must persist over long periods of time. The data ... main memory is often called volatile storage. • The cost of storage per unit of data is an order of magnitude less for disk than for primary storage. 1 Page 102 of 893 Some of...

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... relational databases, users were less concerned about migrating their database applications from other types of database systems for example, network or hierarchical systems to relational systems. ... the result of the query, because the constraint that a relation is a set is not enforced. Figure 08.02(a) shows the result of query Q0 on the database of Figure 07.06. 1...

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... Chapter 10: Examples of Relational Database Management Systems: Oracle and Microsoft Access 10. 1 Relational Database Management Systems: A Historical Perspective 10. 2 The Basic Structure of the ... System 10. 3 Database Structure and Its Manipulation in Oracle 10. 4 Storage Organization in Oracle 10. 5 Programming Oracle Applications 10. 6 Oracle Tools 10. 7 An Ov...

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... replaced by newer offerings. In the interim, we must face the major problem of interoperability—the interoperation of a number of databases belonging to all of the disparate families of DBMSs—as ... UNIVERSITY database schema of Figure 04 .10 in the context of the ODMG object database standard. The mapped object schema using the ODL notation is shown in Figure 12.06....

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... set of inference rules. We defined the concepts of closure and minimal cover of a set of 1 Page 437 of 893 • Database system implementation and tuning (Phase 6): During this phase, the database ... placement of data—an activity referred to as database tuning. Tuning is an ongoing activity—a part of system maintenance that continues for the life cycle of a database...

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... units of database processing. Transaction processing systems are systems with large databases and hundreds of concurrent users that are executing database transactions. Examples of such systems ... any effects of the transaction on the database. The preservation of consistency is generally considered to be the responsibility of the programmers who write the databas...

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... table. The database system must also keep track of all operations on the database that are applied by a certain user throughout each log-in session, which consists of the sequence of database ... information. The 1 Page 646 of 893 Part 6: Advanced Database Concepts & Emerging Applications (Fundamentals of Database Systems, Third Edition) Chapter...

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