By Anthony Finkelstein (auth.), Mohamed Ibrahim, Josef Küng, Norman Revell (eds.)
The Database and specialist structures functions (DEXA) meetings have proven themselves as a platform for bringing jointly researchers and practitioners from a variety of backgrounds and all areas of the area to replace principles, reviews and critiques in a pleasant and stimulating atmosphere. The papers awarded on the convention characterize fresh advancements within the box and demanding steps in the direction of shaping the way forward for utilized machine technological know-how and knowledge structures. DEXA covers a wide box: all elements of databases, wisdom established structures, wisdom administration, web-based platforms, info platforms, similar applied sciences and their purposes. once more there have been quite a few submissions: out of 183 papers that have been submitted, this system committee chosen ninety two to be offered. within the first yr of this new millennium DEXA has get back to the uk, following occasions in Vienna, Berlin, Valencia, Prague, Athens, London, Zurich, Toulouse, Vienna and Florence. The prior decade has obvious a number of innovative advancements, one in all which was once the explosion of Internet-related functions within the components lined by way of DEXA, advancements during which DEXA has performed a job and during which DEXA will proceed to play a task in its moment decade, beginning with this conference.
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Extra resources for Database and Expert Systems Applications: 11th International Conference, DEXA 2000 London, UK, September 4–8, 2000 Proceedings
Take the database schema in Figure 1 as an example. The relationship between the root class and its direct part classes such as SystemB and Monitor is known as level 1 of path 1. Further down, the relationship between SystemB and CPU+RAM is level 2 of path 1. If Monitor is also a composite object, the relationship rooted by Monitor is level 2 of path 2, etc. For simplicity, we call level x of path y to be AGGREGATIONxy. Figure 3 shows the represention of aggregation relationships in the database schema.
Object-Oriented Modeling and Design, Prentice-Hall International, New Jersey, 1991.  Michael Blaha and William Premerlani, Object-Oriented Modeling and Design for Database Applications, Prentice-Hall International, New Jersey, 1998. Knowledge and Data Engineering, vol 11, no. 1, 1999. Kim, Indexing Techniques for Queries on Nested Objects, IEEE Trans. , vol 1, no. 2, pp. 196-214, 1989. Choenni, E. M. Chang, On the Selection of Optimal Index Configuration in OO Databases, Proc. Int’l Conf. , pp.
The second ASR structure considers the composite object in a horizontal direction. It redundantly stores the information between the “whole” and all its direct “parts”. In this way, it is suitable for the query along the “whole” and its “parts”. But it’s not efficient for the queries where there exists a path along a multi-level aggregation relationship and when one wants to know all the “parts” of a composite object, this structure requires a “join” operation among all the separate aggregation indexes.
Database and Expert Systems Applications: 11th International Conference, DEXA 2000 London, UK, September 4–8, 2000 Proceedings by Anthony Finkelstein (auth.), Mohamed Ibrahim, Josef Küng, Norman Revell (eds.)