Method and apparatus for interrupting updates to a database to provide read-only access
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United States of America Patent
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Sep 12, 2006
Grant Date -
Sep 16, 2004
app pub date -
Jan 7, 2004
filing date -
Mar 14, 2003
priority date (Note) -
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Abstract
A method and system for suspending log-based updates to a database in a manner that permits resumption of log-based updating without reinitializing the database. The method and system thereby permit efficient alternation between a log-based update mode and a database access mode. Unplayed log records are protected as revisions of database pages at the time that the log-based update was suspended. This approach permits log-based updating to resume at the same point at which log-based updating was suspended. In order to ensure consistent data for access while in database access mode, a roll-back procedure creates consistent data pages that are used for access and discarded when log-based update resumes.
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