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Using delta relations to optimize condition evaluation in active databases

Author: Elena Baralis; Jennifer Widom; Stanford University. Computer Science Department.
Publisher: Stanford, Calif. : Stanford University, Dept. of Computer Science, [1993]
Series: Report (Stanford University. Computer Science Department), STAN- CS-93-1495.
Edition/Format:   Book : EnglishView all editions and formats
Database:WorldCat
Summary:
Abstract: "We give a method for improving the efficiency of condition evaluation during rule processing in active database systems. The method derives, from a rule condition, two optimized conditions that can be used in place of the original condition when a previous value (true or false) of the original condition is known. The derived conditions are more efficient than the original condition because they replace  Read more...
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Document Type: Book
All Authors / Contributors: Elena Baralis; Jennifer Widom; Stanford University. Computer Science Department.
OCLC Number: 30464433
Notes: Cover title.
"November 1993."
Description: 25 pages ; 28 cm.
Series Title: Report (Stanford University. Computer Science Department), STAN- CS-93-1495.
Responsibility: by Elena Baralis and Jennifer Widom.

Abstract:

Abstract: "We give a method for improving the efficiency of condition evaluation during rule processing in active database systems. The method derives, from a rule condition, two optimized conditions that can be used in place of the original condition when a previous value (true or false) of the original condition is known. The derived conditions are more efficient than the original condition because they replace references to entire database relations by references to delta relations, which typically are much smaller. Delta relations are accessible to rule conditions in almost all current active database systems, making this optimization broadly applicable. We also specify an attribute grammar based implementation of our method."

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