Mirror resynchnronization of fixed page length tables for better repair time to high availability in databases
US9087115B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2014 |
| Grant date | Jul 21, 2015 |
| Priority date | — |
| Expiry date | Jul 24, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/27
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a mirrored database system, mirror resynchronization of fixed length pages is optimized for quick repair and high availability by identifying those lost page changes that must be made for resynchronization and ignoring other duplicate changes. Essential pages are identified using log sequence numbers (LSNs) to locate the most current version of a changed page, and other lower valued LSNs of less current versions of that page are eliminated as having changes that are duplicated in the current version of the page. Page changes since the last database checkpoint before losing mirror synchronization and the current LSN of the transaction log are identified as possibly necessary changes to be made.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.