System and method of distributing replication commands
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United States of America Patent
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Apr 27, 2010
Grant Date -
Aug 19, 2004
app pub date -
Feb 19, 2003
filing date -
Feb 19, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A transactional replication system wherein each replicated command applies to a single row as identified by the primary key, replicated commands are dispatched among multiple connections by hashing of primary key from a single command queue to ensure that changes to the same data row are always dispatched to the same connection to maintain the order of commands as originally occurred on publisher. All connections commit their transactions at the same time in a coordinated fashion without a two phase commit. Retry logic based on a logical sequence number is used to reapply commands from any connection that fails to commit.
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