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dc.contributor.authorLabrinidis, Alexandrosen_US
dc.contributor.authorRoussopoulos, Nicken_US
dc.date.accessioned2004-05-31T21:08:09Z
dc.date.available2004-05-31T21:08:09Z
dc.date.created1998-11en_US
dc.date.issued1998-11-18en_US
dc.identifier.urihttp://hdl.handle.net/1903/502
dc.description.abstractData warehouse maintenance algorithms usually work off-line, making the warehouse unavailable to users. However, since most organizations require continuous operation, we need be able to perform the updates online, concurrently with user queries. To guarantee that user queries access a consistent view of the warehouse, online update algorithms introduce redundancy in order to store multiple versions of the data objects that are being changed. In this paper, we present an online warehouse update algorithm, that stores multiple versions of data as separate rows (vertical redundancy). We compare our algorithm to another online algorithm that stores multiple versions within each tuple by extending the table schema (horizontal redundancy). We have implemented both algorithms on top of an Informix Dynamic Server and measured their performance under varying workloads, focusing on their impact on query response times. Our experiments show that, except for a limited number of cases, vertical redundancy is a better choice, with respect to storage, implementation overhead, and query performance. (Also cross-referenced as UMIACS TR-98-66)en_US
dc.format.extent519212 bytes
dc.format.mimetypeapplication/postscript
dc.language.isoen_US
dc.relation.ispartofseriesUM Computer Science Department; CS-TR-3954en_US
dc.titleA Performance Evaluation of Online Warehouse Update Algorithmsen_US
dc.typeTechnical Reporten_US
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_US
dc.relation.isAvailableAtUniversity of Maryland (College Park, Md.)en_US
dc.relation.isAvailableAtTech Reports in Computer Science and Engineeringen_US
dc.relation.isAvailableAtComputer Science Department Technical Reportsen_US


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