Method and apparatus for optimizing queries over vertically stored database
US7987179B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2008 |
| Grant date | Jul 26, 2011 |
| Priority date | — |
| Expiry date | Jan 15, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/24535
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and device for optimizing queries over a vertically stored database. Items in the database are partitioned into several partitions each having a partition signature. The method includes decomposing a first query received from a user into multiple first subqueries; generating a signature for each first subquery in a way corresponding to the way of generating the partition signature; comparing the signature of each first subquery with partition signatures of all partitions respectively to obtain all partitions matching the first subquery; rewriting a second subquery translated from the first subquery based on the matching partitions to obtain a rewritten second subquery; and composing rewritten second subqueries for all first subqueries to form a second query so that queries are executed over the database using the second query.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.