Purdue University Purdue e-Pubs Department of Computer Science Technical Reports Department of Computer Science 1996 Reducing Intermediate Results for Incremental Updates of Materialized Views Tetsuya Furukawa Ahmed K. Elmagarmid Purdue University,
[email protected] Report Number: 96-037 Furukawa, Tetsuya and Elmagarmid, Ahmed K., "Reducing Intermediate Results for Incremental Updates of Materialized Views" (1996). Department of Computer Science Technical Reports. Paper 1292. https://docs.lib.purdue.edu/cstech/1292 This document has been made available through Purdue e-Pubs, a service of the Purdue University Libraries. Please contact
[email protected] for additional information. REDUCING INTERMEDIATE RESULTS FOR INCREMENTAL UPDATES OF MATERIALIZED VIEWS Tetsuya Furukawa Ahmed K. Elmagannid CSD TR-96-037 June 1996 Reducing Intermediate Results for Incremental Updates of Materialized Views Tetsuya FurukawaH and Ahmed K. Elmagarmidt t Dept. Computer Science, Purdue University West Larayette, IN 47907, USA {furukawa, ake}@cs.purdue.edu :I: Dept. Economic Engineering, Kyushu University Fukuoka 812-81, Japan
[email protected] Abstract To increase retrieval query processing efficiency, views are sometimes materialized in database systems. Since materialized views have to be consistent with their original data, they are updated according to updates of the original data. Materialized view update, how ever, becomes complicated when the view definition includes projection because one view data corresponds to several original data. This paper shows how to reduce the intermediate results to increase query processing efficiency when a materialized view defined with projec tion is updated. We need three steps to update materialized views, to get which view data corresponds with the updated original data, to check whether it indeed have to be updated, and to update the view data.