Efficient undo-processing during data redistribution
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United States of America Patent
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Jun 6, 2017
Grant Date -
May 20, 2010
app pub date -
Nov 20, 2008
filing date -
Aug 29, 2007
priority date (Note) -
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Abstract
A method and system for facilitating an undo operation. In one embodiment, the method includes generating a plurality of control files, where each of the control files is associated with a batch of data that is received from a sending partition during a redistribution process, and where each control file includes a list of pages and corresponding ranges of rows of data that have been appended to the pages. The method also includes writing the control files to a persistent memory for each control file where all of the associated rows of the respective consistency point have been appended to pages and written to a persistent memory. The method also includes, in response to an interruption in the redistribution process, identifying pages and rows to be deleted during an undo operation based on the plurality of control files.
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