By Franca Garzotto (auth.), Albertas Caplinskas, Johann Eder (eds.)
This ebook constitutes the refereed court cases of the fifth East eu convention on Advances in Databases and knowledge structures, ADBIS 2001, held in Vilnius, Lithuania, in September 2001.
The 25 revised complete papers awarded including one invited paper and abstracts of invited talks have been rigorously reviewed and chosen from eighty two submissions. The papers are equipped in topical sections on question optimization, multimedia and multilingual details structures, spatiotemporal facets of databases, information mining, transaction processing, conceptual modeling and data structures specification, energetic databases, question equipment, XML, and data platforms design.
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Extra info for Advances in Databases and Information Systems: 5th East European Conference, ADBIS 2001 Vilnius, Lithuania, September 25–28, 2001 Proceedings
In this way subject indices reflect the domain knowledge from the perspective of the owner of the subject index. Subject indices are not only used to capture “primary knowledge” of domains but also “secondary knowledge” as, for example, - on the organizational and history of a community, including knowledge of users, rights granted to them, etc. , (kind of ) origin, document types, quality, etc. , user classification to handle project-specific access rights. Since entries can contribute to more than one subject term definition they may belong to more than one subject extent maybe in different indices of the same or different types.
E. dead subqueries are removed. The general query processing architecture is presented in Fig. 1. First, the text of a query is parsed and its syntax tree is constructed. Then, the query is optimized by rewriting. Static analysis (performed by a query optimizer) involves a metabase (a special data structure obtained from a database schema), a structure simulating the environment stack (static ES denoted by S ES), and a structure simulating the query result stack (static QRES denoted by S QRES).
This means that the selection operator does not cause any subquery to be dead either (with some exceptions; see Sect. 6). Lecture)) where age > 50 34 J. Plodzie´ n and K. Subieta Obviously, it is impossible to find a query after where which will cause that some subquery before where will be dead. A similar property holds for . 4 Detecting Dead Subqueries In order to optimize a query with regard to dead parts, a modified static analysis is required. In comparison to , a little modified versions of the static eval procedure and the static nested function are used: ds static eval and ds static nested, respectively.