Methods and apparatus for optimizing undo log usage
US5524205A · kind A · utility
188Cited by
9References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1993 |
| Grant date | Jun 4, 1996 |
| Priority date | — |
| Expiry date | Apr 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/87
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Each node in a data processing system contains at least one undo buffer and one least one redo buffer for insuring that any changes made to a section of a non-volatile storage medium, such as a disk, can be removed, if a transaction has not been committed, or can be recreated if the transaction has not been committed. The undo buffers each correspond to a different uncommitted transaction. The redo buffer contains the changes made to a copy of the section which is maintained in the memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.