Validating multiple execution plans for database queries
US7194452B2 · kind B2 · utility
13Cited by
26References
3Claims
0Family size
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Key dates
| Filing date | Nov 24, 2004 |
| Grant date | Mar 20, 2007 |
| Priority date | — |
| Expiry date | Nov 3, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99952
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.