Advanced Database Technology and Design phần 4 potx

... single interval. 1 64 Advanced Database Technology and Design • i1 DURING i2 is true if and only if s2 ≤ s1 and e2 ≥ e1 are both true. 9 • i1 STARTS i2 is true if and only if s1 = s2 and e1 ≤ e2 are ... its single operand and returns another such set. The result in both cases can be regarded as a particular canonical form for the original set. 160 Advanced Database T...

Ngày tải lên: 08/08/2014, 18:21

... Bibliography 48 2 14 Database Quality 48 5 14. 1 Introduction 48 5 14. 2 Data Model Quality 48 8 14. 2.1 Quality Factors 49 0 14. 2.2 Stakeholders 49 0 14. 2.3 Quality Concepts 49 2 14. 2 .4 Improvement Strategies 49 3 14. 2.5 ... However, Evolution and Trends of Database Technology 17 13 .4. 3 Mapping From Conceptual Schema to Logical Schema 47 3 13 .4. 4 Concludin...

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... and the fourth the column number. 50 Advanced Database Technology and Design If Sally is processed before Tom, the constraint is never violated, no rule actions are executed, and both Sally and ... B., E. B. Swanson, and G. E. Tompkins, Characteristics of Applications Soft- ware Maintenance, Comm. ACM, Vol. 21, 1978, pp. 46 6 47 1. 88 Advanced Database Technology a...

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... timepoints are (to repeat) indivisible, and the concept of duration strictly does not apply. 144 Advanced Database Technology and Design Deductive Databases 129 Table 4. 2 Summary of Deductive DBMS Prototypes Deductive Prototypes ... temporal, many relations that could be derived from that database 140 Advanced Database Technology and Design 2. This term, proposed a...

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... involved in 232 Advanced Database Technology and Design Conceptual design UML notation Standard design ODL Implementation design OODBMS Figure 7.3 Design process of an object-oriented database schema. For ... the requirements that will feed an MM-DBMS design. We emphasize the structural complexity and 2 54 Advanced Database Technology and Design 7.2.1 Objects...

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... when generating and evaluating alterna- tive query plans. Section 9 .4 examines query processing and optimization in DDBs. 292 Advanced Database Technology and Design must satisfy, and user access ... can play in complex 2 74 Advanced Database Technology and Design x y t A B C D F E R1 R2 T1* T2* q1 q2 T0* (a) C D A Q (b) Time F E A 10 13 17 20È C B (c) Figure 8 .4...

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... the bandwidth for the downlink communication (from servers to clients) is much greater than the bandwidth 336 Advanced Database Technology and Design 11 Secure Database Systems Elena Ferrari and ... wireless network in the same way as working 344 Advanced Database Technology and Design [36] Özsu, M. T., and P. Valduriez, Principles of Distributed Database Systems,...

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... the problem of design and development of component DBMSs and their appli- cations. Because the type of systems considered here are only in the process of 42 4 Advanced Database Technology and Design Table ... able to handle nonstandard data so far kept in specialized data stores. 40 6 Advanced Database Technology and Design Application DBMS Figure 12.1 Nonstandard...

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... software engineering projects. 44 0 Advanced Database Technology and Design [44 ] Geppert, A., S. Scherrer, and K. R. Dittrich, KIDS: A Construction Approach for Database Management Systems Based ... X → Y and W ⊇ Z, then X,W → Y,Z. • R3 (transitivity): If X → Y and Y → Z, then X → Z. • R4 (pseudo-transitivity): If X → Y and Y,W → Z, then X,W → Z. 45 6 Advanced Datab...

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... probably 48 8 Advanced Database Technology and Design Schemas (continued) conceptual, 35, 39 43 , 53 54 conflict between, 46 3 64 conforming, 46 6 E/R, 49 9 external, 49 integration, 44 7, 46 366 internal, ... modeling, 33 46 creative design, 44 950 defined, 35 languages, 35, 37 model choice, 44 8 49 natural language understanding, 45 3 54 purposes, 26 reverse...

Ngày tải lên: 08/08/2014, 18:21