Name
Abstract | ||
|---|---|---|
We study optimization of relational queries using materialized views, where views may be regular or restructured. In a restructured view, some data from the base table(s) are represented as metadata - that is, schema information, such as table and attribute names - or vice versa.Using restructured views in query optimization opens up a new spectrum of views that were not previously available, and can result in significant additional savings in query-evaluation costs. These savings can be obtained due to a significantly larger set of views to choose from, and may involve reduced table sizes, elimination of self-joins, clustering produced by restructuring, and horizontal partitioning.In this paper we propose a general query-optimization framework that treats regular and restructured views in a uniform manner and is applicable to SQL select-project-join queries and views with or without aggregation. Within the framework we provide (1) algorithms to determine when a view (regular or restructured) is usable in answering a query, and (2) algorithms to rewrite a query using usable views.Semantic information, such as knowledge of the key of a view, can be used to further optimize a rewritten query. Within our general query-optimization framework, we develop techniques for determining the key of a (regular or restructured) view, and show how this information can be used to further optimize a rewritten query. It is straightforward to integrate all our algorithms and techniques into standard query-optimization algorithms. |
Year | DOI | Venue |
|---|---|---|
2006 | 10.1145/1183614.1183706 | CIKM |
Keywords | Field | DocType |
usable view,general query-optimization framework,schema information,select-project-join query,query optimization,attribute name,semantic information,base table,table size,standard query-optimization algorithm,materialized views,spectrum | Query optimization,SQL,USable,Metadata,Data mining,Information retrieval,Computer science,View,Cluster analysis,Materialized view,Schema (psychology),Database | Conference |
ISBN | Citations | PageRank |
1-59593-433-2 | 1 | 0.35 |
References | Authors | |
23 | 2 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Rada Chirkova | 1 | 450 | 36.53 |
| Fereidoon Sadri | 2 | 846 | 283.70 |