The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 2006
Filed:
Nov. 15, 2002
Surendra Verma, Bellevue, WA (US);
Jonathan M. Cargille, Seattle, WA (US);
Jacob P. Lacouture, Redmond, WA (US);
Brian D. Andrew, Redmond, WA (US);
Sameet H. Agarwal, Redmond, WA (US);
Surendra Verma, Bellevue, WA (US);
Jonathan M. Cargille, Seattle, WA (US);
Jacob P. Lacouture, Redmond, WA (US);
Brian D. Andrew, Redmond, WA (US);
Sameet H. Agarwal, Redmond, WA (US);
Microsoft Corporation, Redmond, WA (US);
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.