Fundamentals of Database systems 3th edition PHẦN 6 ppt

... Organizations 16. 2 The Database Design Process 16. 3 Physical Database Design in Relational Databases 16. 4 An Overview of Database Tuning in Relational Systems 16. 5 Automated Design Tools 16. 6 Summary ... Design 16. 2.3 Phase 3: Choice of a DBMS 16. 2.4 Phase 4: Data Model Mapping (Logical Database Design) 16. 2.5 Phase 5: Physical Database Design...

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...

Ngày tải lên: 08/08/2014, 18:22

... (UWA) variable. 1 Page 7 96 of 893 Appendix D: An Overview of the Hierarchical Data Model (Fundamentals of Database Systems, Third Edition) D.1 Hierarchical Database Structures D.2 ... International Workshop on Expert Database Systems, Kiawah Island, SC, October 1984), Benjamin/Cummings, 19 86. EDS [19 86] Expert Database Systems, Kerschberg, L., ed....

Ngày tải lên: 08/08/2014, 18:22

... unique. 1 Page 59 of 893 I 841 J 842 K 843 L 8 46 M 848 N 850 O 852 P 853 R 854 S 855 T 861 U 861 UU V 862 W 864 Y 866 Z 866 Copyright Information 868 1 Page 11 of 893 statement ... Normal Forms 462 15 .6 Summary 463 Review Questions 463 Exercises 464 Selected Bibliography 465 Footnotes 465 Chapter 16: Practical Database Design and Tuning 467 1 Page 6 o...

Ngày tải lên: 08/08/2014, 18:22

... 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 ... quite large. With typical tape densities of 160 0 to 62 50 bytes per inch, a typical interblock gap (Note 5) of 0 .6 inches corresponds to 960 to 3750 bytes of wasted storage space....

Ngày tải lên: 08/08/2014, 18:22

... 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 Page 213 of 893 Strictly ... less concerned about migrating their database applications from other types of database systems for example, network or hierarchical systems to relational systems. The r...

Ngày tải lên: 08/08/2014, 18:22

... 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 Oracle ... model yet offer a whole variety of features needed to accomplish the design and implementation of large databases and their applications. An Oracle server consists of an Oracle...

Ngày tải lên: 08/08/2014, 18:22

... 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. 12 .6 Examples of ODBMSs ... 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 di...

Ngày tải lên: 08/08/2014, 18:22

... Footnotes The concept of transaction provides a mechanism for describing logical units of database processing. Transaction processing systems are systems with large databases and hundreds of concurrent ... compare your own query trees of part (a) and the initial and final query trees of part (b). 18.14. A file of 40 96 blocks is to be sorted with an available buffer spa...

Ngày tải lên: 08/08/2014, 18:22

... information. The 1 Page 64 6 of 893 Part 6: Advanced Database Concepts & Emerging Applications (Fundamentals of Database Systems, Third Edition) Chapter 23: Enhanced Data Models ... 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 t...

Ngày tải lên: 08/08/2014, 18:22