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Reducing the cost of accessing relations in incremental view maintenance [An article from: Decision Support Systems]
Book Details
Author(s)K.Y. Lee, J.H. Son, M.H. Kim
PublisherElsevier
ISBN / ASINB000PDT616
ISBN-13978B000PDT613
MarketplaceIndia 🇮🇳
Description
This digital document is a journal article from Decision Support Systems, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
In the data warehouse environment, the concept of a materialized view is common and important for efficient support of OLAP query processing. Materialized views are generally derived from several relations. These materialized views need to be updated when source relations change. Since the propagation of updates to the views may impose a significant overhead, it is essential to update the warehouse views efficiently. Though various view maintenance strategies have been discussed in the past, optimizations on the total accesses to relations have not been sufficiently investigated. In this paper we propose an efficient incremental view maintenance method called optimal delta evaluation that can minimize the total accesses to relations. We first present the delta evaluation expression and a delta evaluation tree which are core concepts of the method. Then, a dynamic programming algorithm that can find the optimal delta evaluation tree is proposed. We also present various experimental results that show the usefulness and efficiency of our proposed method.
Description:
In the data warehouse environment, the concept of a materialized view is common and important for efficient support of OLAP query processing. Materialized views are generally derived from several relations. These materialized views need to be updated when source relations change. Since the propagation of updates to the views may impose a significant overhead, it is essential to update the warehouse views efficiently. Though various view maintenance strategies have been discussed in the past, optimizations on the total accesses to relations have not been sufficiently investigated. In this paper we propose an efficient incremental view maintenance method called optimal delta evaluation that can minimize the total accesses to relations. We first present the delta evaluation expression and a delta evaluation tree which are core concepts of the method. Then, a dynamic programming algorithm that can find the optimal delta evaluation tree is proposed. We also present various experimental results that show the usefulness and efficiency of our proposed method.
