Estrategia de procesamiento y optimización de consultas en un gestor de bases de datos federadas
Based on BLOOM (BarceLona Object-Oriented Model), we propose to establish a global query processing strategy in the Federated Query Manager. First, the developing mechanism constructs a tree, which has nodes that initially represent explicit joins between federated classes and that are decomposed, i...
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| Tipo de recurso: | informe técnico |
| Fecha de publicación: | 2001 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | español |
| OAI Identifier: | oai:upcommons.upc.edu:2117/97825 |
| Acceso en línea: | https://hdl.handle.net/2117/97825 |
| Access Level: | acceso abierto |
| Palabra clave: | BLOOM BarceLona Object-Oriented Model Federated query manager Global query Processing strategy Optimization EP Execution plans Àrees temàtiques de la UPC::Informàtica::Sistemes d'informació |
| Sumario: | Based on BLOOM (BarceLona Object-Oriented Model), we propose to establish a global query processing strategy in the Federated Query Manager. First, the developing mechanism constructs a tree, which has nodes that initially represent explicit joins between federated classes and that are decomposed, into implicit joins between classes in the Component Schemas. Consequently, different heuristic techniques are performed in order to optimise the decomposition process, which generate one or more Execution Plans (EP). After that, the EP are analysed to get the optimum. The objective function of this strategy is to choose an execution plan with the least total resource usage and the best response time. Finally, the consolidation of partial results is carried out maintaining the federated result in the root node. |
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