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The Dangers of Replication and a Solution

Jim Gray, Pat Helland, Patrick O'Neil, and Dennis Shasha


Update anywhere-anytime-anyway transactional replication has unstable behavior as the workload scales up: a ten-fold increase in nodes and traffic gives a thousand fold increase in deadlocks or reconciliations. Master copy replication (primary copy) schemes reduce this problem. A simple analytic model demonstrates these results. A new two-tier replication algorithm is proposed that allows mobile (disconnected) applications to propose tentative update transactions that are later applied to a master copy. Commutative update transactions avoid the instability of other replication schemes.


Publication typeInproceedings
InstitutionMicrosoft Research
PublisherAssociation for Computing Machinery, Inc.
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