Title :
Adding physical optimization to cost models in information mediators
Author :
Hidalgo, Justo ; Pan, Alberto ; Losada, José ; Álvarez, Manuel
Author_Institution :
Denodo Technol., Inc., Coruna
Abstract :
Optimization of execution plans in information mediators is a critical task, especially when sources are remote and semistructured, as in the case of transactional Web sites. Lack of quality of service in HTTP connections does not ease the measurement of the mediated query performance. Different solutions based on relational and hierarchical optimization techniques have been proposed, mainly in terms of time and space. This article integrates some of these techniques by using a specialized cost repository but, more importantly, defines a physical layer optimization cost model by means of a configurable pool of browsers, which improves dramatically query execution time in Web mediators
Keywords :
Internet; query processing; Web mediators; execution plan optimization; information mediators; physical layer optimization cost model; query execution time; transactional Web sites; Concrete; Cost function; Databases; Delay; Educational programs; HTML; Physical layer; Quality of service; Sampling methods; Statistics;
Conference_Titel :
e-Business Engineering, 2005. ICEBE 2005. IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7695-2430-3
DOI :
10.1109/ICEBE.2005.21