Page recovery using volume snapshots and logs
US7814057B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2005 |
| Grant date | Oct 12, 2010 |
| Priority date | — |
| Expiry date | Apr 25, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/84
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Systems and methods are disclosed that facilitate providing page-level database restore functionality upon detection of a corruption event. Updates to a data page in a database can trigger generation of a snapshot of the data page, and an update log can be maintained that stores information related to page updates. Subsequent snapshots can be generated at predetermined intervals and can trigger truncation of a log segment and initiation of a new log segment. Upon detection of page corruption, a most-recent uncorrupt snapshot of the corrupt page can be identified, copied to the location of the corrupt page in the database, and modified according to the log segment associated with the uncorrupt snapshot to make the page current as of the corrupting event, all of which can be performed to restore the database without having to take the database offline.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.