Database backup method
US4686620A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1984 |
| Grant date | Aug 11, 1987 |
| Priority date | — |
| Expiry date | Jul 26, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99953
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method of generating a backup copy of a database system. Modifications made to the database since the generation of a prior backup copy are summarized in a bit map on a page basis. When the next backup copy is made, only modified pages are transmitted and merged with the prior copy. Plural backup passes are made. New modifications are allowed to occur to the database on all but the last pass. Any database modification made at an address that has already been examined during a pass is backed-up during the next pass. Modifications are locked out at the beginning of the last pass to allow the final generation of a consistent and complete backup copy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.