Date of Award
Master of Science
Dr. Robert Trenary
Dr. Dalia Motzkin
Masters Thesis-Open Access
Currently proposed methods for retrieval of records from a generalized file organization are not optimal, causing more I\0 retrievals than are necessary. This paper proposes another technique that has near optimal results and has a polynomial order of complexity.
The technique takes as input a query in disjunctive form, sorts the keys in the query in ascending order according to the number of records associated with them, then using a table much like a prime implicant table, systematically searches for a complete cover of the query conjuncts with a minimum total number of records associated with the keys that are chosen for the cover.
This technique along with two current query optimization techniques were implemented and an a posterior analysis of the algorithm was made for reliability in finding the optimal solution to randomly generated queries.
Mautz, Caroline D., "A Query Optimization Method for Use in a Generalized Database" (1986). Masters Theses. 1328.