Transactions on Large-Scale Data- and Knowledge-Centered Systems I

Cet article decrit nos propositions en matiere de transactions mobiles. Nous considerons des environnements mobiles composes de diverses unites et gerant des bases de donnees. Pour nous une transaction mobile est une transaction ou l'une des composantes au moins s'execute sur une unite mobile. Nous decrivons les caracteristiques des environnements mobiles et nous proposons (1) un modele de transactions mobiles adaptable au contexte d'execution, le modele AMT, (2) une etude analytique du modele AMT qui permet de choisir la meilleure strategie d'execution d'une transaction mobile et (3) un intergiciel (TransMobi) comme support du modele AMT. Nous avons egalement propose un protocole specifique de validation (CO2PC) qui combine une approche optimiste avec un protocole de validation a deux phases. Il autorise une validation optimiste ou non-optimiste des transactions composantes permettant ainsi plus de souplesse dans la validation.

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