Validating multiple execution plans for database queries

Details Validating multiple execution plans for database queries Validating multiple execution plans for database queries

2006-03-07

2006-03-07

Gaffin, Jeffrey (Department: 2165)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C707S793000, C707S793000, C707S793000, C709S241000, C709S206000

Reexamination Certificate

active

07010524

ABSTRACT:
Validation of large numbers of alternative execution plans for a database query, either an exhaustive enumeration of the complete space of alternatives, or else an unbiased random sample, is performed by efficiently constructing execution trees from a data structure having groups alternative operators that are ranked in a directory. Each global rank of a plan identifies that plan uniquely among all the alternative plans. The operators are unranked from the directory according to a specification that characterizes the desired plans.

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