Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/14208
Título: Performance Analysis of One-to-Many Data Transformations
Autor: Carreira, Paulo J.F.
Galhardas, Helena
Pereira, João
Martins, Fernando
Silva, Mário J.
Palavras-chave: Data Warehousing
Data Cleaning
Data Integration
Query Optimization
Data: Dez-2006
Editora: Department of Informatics, University of Lisbon
Relatório da Série N.º: di-fcul-tr-06-25
Resumo: Relational Database Systems often support activities like data warehousing, cleaning and integration. All these activities require performing some sort of data transformations. Since data often resides on relational databases, data transformations are often specified using SQL, which is based of relational algebra. However, many useful data transformations cannot be expressed as SQL queries due to limited expressive power of relational algebra. In particular, an important class of data transformations that produces several output tuples for a single input tuple cannot be expressed in that way. In this report, we analyze alternatives to process one-to-many data transformations using Relational Database Systems, and compare them in terms of expressiveness, optimizability and performance
URI: http://hdl.handle.net/10451/14208
http://repositorio.ul.pt/handle/10455/2913
Aparece nas colecções:FC-DI - Technical Reports

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