Page recovery using volume snapshots and logs
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United States of America Patent
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Oct 12, 2010
Grant Date -
Oct 5, 2006
app pub date -
Apr 5, 2005
filing date -
Apr 5, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Systems and methods are disclosed that facilitate providing page-level database restore functionality upon detection of a corruption event. Updates to a data page in a database can trigger generation of a snapshot of the data page, and an update log can be maintained that stores information related to page updates. Subsequent snapshots can be generated at predetermined intervals and can trigger truncation of a log segment and initiation of a new log segment. Upon detection of page corruption, a most-recent uncorrupt snapshot of the corrupt page can be identified, copied to the location of the corrupt page in the database, and modified according to the log segment associated with the uncorrupt snapshot to make the page current as of the corrupting event, all of which can be performed to restore the database without having to take the database offline.
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