Distributed database recovery
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United States of America Patent
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Apr 23, 2013
Grant Date -
Mar 10, 2011
app pub date -
Sep 8, 2009
filing date -
Sep 8, 2009
priority date (Note) -
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Abstract
A method and apparatus for recovery a cluster database is provided. Database recovery is divided among a plurality of surviving database server instances in the cluster. A surviving instance is responsible for recovering data blocks to which the surviving instance is assigned. One form of block-to-instance assignment may be based on mastership of the blocks. If a data block is locked by a surviving instance at the time of failure, then no recovery of that data block may be necessary. Else, if a copy of a data block that is to be recovered is stored on a surviving node in the cluster, then one or more redo records are applied to that copy (if necessary). A redo record that corresponds to that data block might not need to be applied to the copy if the redo record reflects changes (to the data block) that are already reflected in the copy.
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