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Authors: Tomasz Marek Kowalski 1 ; Radosław Adamus 1 ; Jacek Wiślicki 1 and Michał Bleja 2

Affiliations: 1 Technical University of Lodz, Poland ; 2 University of Lodz, Poland

ISBN: 978-989-8565-10-5

ISSN: 2184-4992

Keyword(s): Query Optimization, Independent Subqueries, Object-Oriented Database, Stack-Based Approach, SBQL.

Related Ontology Subjects/Areas/Topics: Databases and Information Systems Integration ; Enterprise Information Systems ; Non-Relational Databases ; Object-Oriented Database Systems ; Query Languages and Query Processing

Abstract: The following paper presents generalisation of the independent subquery method for object-oriented query languages. A subquery is considered independent if none of involved names is bound in a stack section opened by a currently evaluated non-algebraic operator. Optimisation of such a subquery is accomplished by factoring it out from a loop implied by its query operator. We generalise the method to factor out also subqueries that are evaluated only in a context of independent subqueries of a given query. The query is rewritten to an equivalent form ensuring much better performance. Our research bases on the Stack-Based Architecture of query languages having roots in semantics of programming languages. The paper illustrates the method on an comprehensive example and finally presents the general rewriting rule.


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Paper citation in several formats:
Marek Kowalski, T.; Adamus, R.; Wiślicki, J. and Bleja, M. (2012). Generalized Independent Subqueries Method.In Proceedings of the 14th International Conference on Enterprise Information Systems - Volume 2: ICEIS, ISBN 978-989-8565-10-5, ISSN 2184-4992, pages 200-204. DOI: 10.5220/0003994802000204

author={Tomasz Marek Kowalski. and Radosław Adamus. and Jacek Wiślicki. and Michał Bleja.},
title={Generalized Independent Subqueries Method},
booktitle={Proceedings of the 14th International Conference on Enterprise Information Systems - Volume 2: ICEIS,},


JO - Proceedings of the 14th International Conference on Enterprise Information Systems - Volume 2: ICEIS,
TI - Generalized Independent Subqueries Method
SN - 978-989-8565-10-5
AU - Marek Kowalski, T.
AU - Adamus, R.
AU - Wiślicki, J.
AU - Bleja, M.
PY - 2012
SP - 200
EP - 204
DO - 10.5220/0003994802000204

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