Replicating updates in original temporal order in parallel processing database systems
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United States of America Patent
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Aug 20, 2002
Grant Date -
N/A
app pub date -
Dec 23, 1999
filing date -
Dec 23, 1999
priority date (Note) -
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Abstract
A method, apparatus, and article of manufacture for replicating modifications made to a subject table from a primary system to a subscriber system. A subject table is partitioned across a plurality of processors in both the primary and subscriber systems, wherein each of the processors manages at least one partition of the subject table. Change row messages are generated for each modification made to a subject table, wherein the change row message identifies the processor in the primary system making the modification, and includes a sequence number for the processor in the primary system. The processor in the primary system identified in the change row message is re-mapped to a new processor in the subscriber system and the sequence number for the processor in the primary system identified in the change row message is re-mapped to a new sequence number for the new processor in the subscriber system, so that the modifications are applied in a correct order on the subscriber system.
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