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:
Jul. 01, 2014
Filed:
Mar. 14, 2007
Laurion D. Burchall, Seattle, WA (US);
Andrew E. Goodsell, Redmond, WA (US);
Brett A. Shirley, Bellevue, WA (US);
Laurion D. Burchall, Seattle, WA (US);
Andrew E. Goodsell, Redmond, WA (US);
Brett A. Shirley, Bellevue, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A continuous set of committed transactions can be lost without destroying the integrity of the database, by deferring the writing of the database pages stored in cache to the database on stable storage. A waypoint tracks a point in the transaction log following which transactions have not been applied to the database on stable storage and thus records after the waypoint are not needed for recovery to a consistent database. When there is a failover of an active database on Node A to a passive database on Node B, log records are compared starting with the most current and moving backwards and the point at which divergence in the log occurs is determined. When the lost portion of the log occurs after the point indicated by after the waypoint, the database is recoverable by log-based incremental reseed.