Oracle's symmetric replication technology and implications for application design

Daniels, Dean; Doo, Lip Boon; Downing, Alan; Elsbernd, Curtis; Hallmark, Gary; Jain, Sandeep; Jenkins, Bob; Lim, Peter; Smith, Gardner W.; Souder, Benny; Stamos, Jim

doi:10.1145/191839.191930

Cited by 14 publications

(5 citation statements)

References 1 publication

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“…Étape s 5 De la même manière que pour l'étape s 4 sur le site de l'utilisateur u 2 , cette étape consiste à exécuter les opérations reçues depuis la dernière synchronisation, c'est à dire les opérations op 2 , op 3 et op 5 .…”

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A safe and generic model for synchronizing divergent data

Oster

Molli

Skaf-Molli

et al. 2004

Proceedings of the 1st French-Speaking Conference on Mobility and Ubiquity Computing -

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La réconciliation de données divergentes est un des problèmes clefs de l'informatique mobile, ainsi que des systèmes de gestion de configuration. Malgré le nombre important de synchroniseurs et d'outils de fusion qui traitent ce problème, aucun critère de correction d'un processus de synchronisation n'existe.Dans cet article, nous proposons d'utiliser le modèle des transformées opérationnelles pour raisonner sur la synchronisation de données divergentes. Nous présentons un algorithme et des fonctions de transformation qui réalisent la réconciliation d'un système de fichiers. Contrairement aux autres synchroniseurs, notre système garantit des propriétés bien définies telles que la convergence et le respect de la causalité. Il est également extensible à d'autres types de données.

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Section: Exempleunclassified

“…Si deux transactions travaillent sur deux copies différentes et modifient le même tuple concurremment, un conflit apparaît. Oracle [5] fournit plusieurs méthodes de résolution de conflits. Par exemple, la méthode de la "dernière estampille" résout les conflits en se basant sur la plus récente mise à jour.…”

Section: éTat De L'artunclassified

A safe and generic model for synchronizing divergent data

Oster

Molli

Skaf-Molli

et al. 2004

Proceedings of the 1st French-Speaking Conference on Mobility and Ubiquity Computing -

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show abstract

“…If two transactions working on two different replicas, update the same row at the same time, a conflict can occur. Oracle [5] provides built-in resolution methods for resolving update conflicts. The "latest timestamp" value resolves a conflict based most recent update.…”

Section: Related Workmentioning

confidence: 99%

Using the transformational approach to build a safe and generic data synchronizer

Molli

Oster

Skaf-Molli

et al. 2003

Proceedings of the 2003 International ACM SIGGROUP Conference on Supporting Group Work

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Reconciliating divergent data is an important issue in concurrent engineering, mobile computing and software configuration management. Currently, a lot of synchronizers or merge tools perform reconciliations. However, they do not define what is the correctness of their synchronisation. In this paper, we propose to use a transformational approach as the basic model for reasonning about synchronisation. We propose an algorithm and specific transformation functions that realize a file system synchronisation. Unlike classic synchronizers, our synchronizer ensures properties of convergence, causality and intention preservation and is extensible to new data types.

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“…With its resiliency to network failures, high data availability, and cooperative data sharing, optimistic replication has become an enabling technology for mobile computing. Oracle 7 [1], Bayou [14], Ingres, Lotus Notes [5], Microsoft Briefcase, and the Concurrent Version System are popular applications that have adopted the optimistic replication concept [8].…”

Section: Introductionmentioning

confidence: 99%

Understanding the behavior of the conflict-rate metric in optimistic peer replication

Wang¹,

Reiher²,

Bagrodia³

et al.

Proceedings. 13th International Workshop on Database and Expert Systems Applications

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Optimistic replication of data is a widely used tool for mobile environments, but the behavior of concurrent conflicting updates caused by the relaxed consistency model is poorly understood.Through analytical modeling, we derive an exact bound for conflict rates for the common case of two replicas. The shape of the two-replica analytic curve matches well with simulation results at 50 replicas.Our result shows that (1) both frequently and infrequently synchronized mobile machines operate in the low regions of the conflict-rate curve; (2) conflict rate is not well suited for comparing systems, since multiple system settings can result in the same conflict rate number; and (3) the conflict rate is highly dependent on the characteristics of data flow paths.

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Oracle's symmetric replication technology and implications for application design

Cited by 14 publications

References 1 publication

A safe and generic model for synchronizing divergent data

A safe and generic model for synchronizing divergent data

Using the transformational approach to build a safe and generic data synchronizer

Understanding the behavior of the conflict-rate metric in optimistic peer replication

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