Abstract
Most declarative SQL-like query languages for object-oriented database systems are orthogonal languages allowing for arbitrary nesting of expressions in the select-, from-, and where-clause. Expressions in the from-clause may be base tables as well as set-valued attributes. In this paper, we propose a general strategy for the optimization of nested OOSQL queries. As in the relational model, the translation/optimization goal is to move from tuple- to set-oriented query processing. Therefore, OOSQL is translated into the algebraic language ADL, and by means of algebraic rewriting nested queries are transformed into join queries as far as possible. Three different optimization options are described, and a strategy to assign priorities to options is proposed.
Original language | English |
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Title of host publication | Proceedings of 20th International Conference on Very Large Data Bases (VLDB 1994) |
Publisher | Morgan Kaufmann Publishers |
Pages | 618-629 |
Number of pages | 12 |
ISBN (Print) | 1-55860-153-8 |
Publication status | Published - Sep 1994 |
Event | 20th International Conference on Very Large Data Bases, VLDB 1994 - Santiago de Chile, Chile Duration: 12 Sep 1994 → 15 Sep 1994 Conference number: 20 |
Conference
Conference | 20th International Conference on Very Large Data Bases, VLDB 1994 |
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Abbreviated title | VLDB |
Country/Territory | Chile |
City | Santiago de Chile |
Period | 12/09/94 → 15/09/94 |
Keywords
- DB-OODB: OBJECT-ORIENTED DATABASES