Identifying appropriate undo during a forward pass through a...

Details Identifying appropriate undo during a forward pass through a... Identifying appropriate undo during a forward pass through a...

2006-04-25

2006-04-25

Le, Dieu-Minh (Department: 2114)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S016000

Reexamination Certificate

active

07036044

ABSTRACT:
The location of appropriate undo data necessary for reversing an effect of an operation performed at a computer system is identified during a forward pass through a log. A cycle count can be used to determine if appropriate undo data is stored in an object or is stored in auxiliary storage. If appropriate undo data is stored in an object and the undo data would be potentially lost by processing a redo log entry to modify the contents of the object, the appropriate undo data is copied to auxiliary storage. In some embodiments, a secondary computer system receives log entries from a primary computer system. The secondary computer system can identify undo data necessary to reverse an effect of an operation performed at the secondary computer system from received log entries. Identified undo data can be copied auxiliary storage at the secondary computer system.

REFERENCES:
patent: 5864849 (1999-01-01), Bohannon et al.
patent: 5903898 (1999-05-01), Cohen et al.
patent: 6154847 (2000-11-01), Schofield et al.
patent: 2002/0143733 (2002-10-01), Mukkamalla et al.

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