An integrated approach to database design

Yao, S. Bing; Navathe, Shamkant B.; Weldon, Jay-Louise

doi:10.1007/3-540-11214-6_1

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…It further selects a primary fragment F/' of this class Ci most appropriate to merge with this derived fragment F/a and eventually produces a non-overlapping set of horizontal fragments that has incorporated method dependency information. Finally, since it is possible to place an object in more than one primary fragment, Affinity Rule 5.2 is used to find the primary fragment with which it has the greatest affinity (line (15)(16)(17)(18)(19)(20)(21)(22)) and it is removed from all other (line (23-25)). 7.…”

Section: The Algorithmmentioning

confidence: 99%

A comprehensive approach to horizontal class fragmentation in a Distributed Object Based System

Ezeife

Barker

1995

Distrib Parallel Databases

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Optimal application performance on a Distributed Object Based System (DOBS) requires class fragmentation and the development of allocation schemes to place fragments at distributed sites so data transfer is minimized. Fragmentation enhances application performance by reducing the amount of irrelevant data accessed and the amount of data transferred unnecessarily between distributed sites. Algorithms for effecting horizontal and vertical fragmentation of relations exist, but fragmentation techniques for class objects in a distributed object based system are yet to appear in the literature. This paper first reviews a taxonomy of the fragmentation problem in a distributed object base. The paper then contributes by presenting a comprehensive set of algorithms for horizontally fragmenting the four realizable class models on the taxonomy. The fundamental approach is top-down, where the entity of fragmentation is the class object. Our approach consists of first generating primary horizontal fragments of a class based on only applications accessing this class, and secondly generating derived horizontal fragments of the class arising from primary fragments of its subclasses, its complex attributes (contained classes), and/or its complex methods classes. Finally, we combine the sets of primary and derived fragments of each class to produce the best possible fragments. Thus, these algorithms account for inheritance and class composition hierarchies as well as method nesting among objects, and are shown to be polynomial time.

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Section: The Algorithmmentioning

confidence: 99%

A comprehensive approach to horizontal class fragmentation in a Distributed Object Based System

Ezeife

Barker

1995

Distrib Parallel Databases

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“…Its design can be divided into two distinct parts: logical and physical [36]. The logical design describes the relation between data items and the way they are perceived by the users.…”

Section: The Implementation Of a Prototypementioning

confidence: 99%

“…U is a set of users who can be from the operations level, management control level, strategic planning level, or from a combination of these levels [4]. D, although it still represents needed data sets, can now be ad hoc sets obtained irregularly, or a knowledge base obtained by a logical data base design process [14,36], or by an artificial intelligence procedure [29], or both. D* is a data management component which can be a sophisticated Data Base Management System (DBMS), or can be a file system.…”

Section: Evolution Of Design Considerationsmentioning

confidence: 99%

Decision support system: An activity-oriented design

Sen

1983

Journal of Information Science

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Decision Support Systems (DSSs) have been defined in a number of ways by various researchers. The result is disagreement and confusion. No one is quite sure of its exact definition.In this research, we have tned to redefine it by asking two basic questions: What things to support and how to support them? It is argued that critical activity analysis is a preferable starting point for a DSS design, and a DSS needs to support activities rather than decisions. A tool-kit framework for a DSS is presented for its design. Finally, a case study application is described where such a framework has been implemented in APL.

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Unsolvable problems related to the view integration approach

Convent

1986

Icdt '86

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An integrated approach to database design

Cited by 8 publications

References 38 publications

A comprehensive approach to horizontal class fragmentation in a Distributed Object Based System

A comprehensive approach to horizontal class fragmentation in a Distributed Object Based System

Decision support system: An activity-oriented design

Unsolvable problems related to the view integration approach

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