High availability via data services
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United States of America Patent
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Oct 30, 2007
Grant Date -
N/A
app pub date -
Oct 2, 2003
filing date -
Oct 2, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
Application-level replication, the synchronization of data updates within a cluster of application servers, may be provided by having application servers themselves synchronize all updates to multiple redundant databases, precluding the need for database-level replication. This may be accomplished by first sending a set of database modifications requested by the transaction to a first database. Then a message may be placed in one or more message queues, the message indicating the objects inserted, updated, or deleted in the transaction. Then a commit command may be sent to the first database. The set of database modifications and a commit command may then be sent to a second database. This allows for transparent synchronization of the databases and quick recovery from a database failure, while imposing little performance or network overhead.
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