Methods and apparatus for optimizing undo log usage
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United States of America Patent
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Jun 4, 1996
Issued Date -
N/A
app pub date -
Apr 21, 1993
filing date -
Jun 29, 1990
priority date (Note) -
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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.
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