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Maintenance of Data Cubes and Summary Tables in a Warehouse

Mumick, I. and Quass, D. and Mumick, B. (1997) Maintenance of Data Cubes and Summary Tables in a Warehouse. In: ACM International Conference on Management of Data (SIGMOD 1997), May 13-15, 1997, Tucson, Arizona.




Data warehouses contain large amounts of information, often collected from a variety of independent sources. Decisionsupport functions in a warehouse, such as on-line analytical processing involve hundreds of complex aggregate queries over large volumes of data. It is not feasible to compute these queries by scanning the data sets each time. Warehouse applications therefore build a large number of summary tables, or materialized aggregate views, to help them increase the system performance. As changes, most notably new transactional data, are collected at the data sources, all summary tables at the warehouse that depend upon this data need to be updated. Usually, source changes are loaded into the warehouse at regular intervals, usually once a day, in a batch window, and the warehouse is made unavailable for querying while it is updated. Since the number of summary tables that need to be maintained is often large, a critical issue for data warehousing is how to maintain the summary tables effcientlyIn this paper we propose a method of maintaining aggregate views (the summary-delta table methoand use it to solve two problems in maintaining summary tables in a warehouse: (1) how to effciently maintain a summary table while minimizing the batch window needed for maintenance, and (2) how to maintain a large set of summary tables defined over the same base tables. While several papers have addressed the issues relating to choosing and materializing a set of summary tables, this is the first paper to address maintaining summary tables effcientl

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:view maintenance, aggregation, summary table, data warehousing, olap
Subjects:Computer Science > Data Warehousing
Related URLs:Project Homepage
ID Code:259
Deposited By:Import Account
Deposited On:25 Feb 2000 16:00
Last Modified:01 Jan 2009 12:25

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