Ensuring relaxed atomicity for flexible transactions in multidatabase systems

Author:

Zhang Aidong1,Nodine Marian2,Bhargava Bharat1,Bukhres Omran1

Affiliation:

1. Department of Computer Science, Purdue University, West Lafayette, IN

2. Department of Computer Science, Brown University, Providence, RI

Abstract

Global transaction management requires cooperation from local sites to ensure the consistent and reliable execution of global transactions in a distributed database system. In a heterogeneous distributed database (or multidatabase) environment, various local sites make conflicting assertions of autonomy over the execution of global transactions. A flexible transaction model for the specification of global transactions makes it possible to deal robustly with these conflicting requirements. This paper presents an approach that preserves the semi-atomicity (a weaker form of atomicity) of flexible transactions, allowing local sites to autonomously maintain serializability and recoverability. We offer a fundamental characterization of the flexible transaction model and precisely define the semi-atomicity. We investigate the commit dependencies among the subtransactions of a flexible transaction. These dependencies are used to control the commitment order of the subtransactions. We next identify those restrictions that must be placed upon a flexible transaction to ensure the maintenance of its semi-atomicity. As atomicity is a restrictive criterion, semi-atomicity enhances the class of executable global transactions.

Publisher

Association for Computing Machinery (ACM)

Subject

Information Systems,Software

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