Whenever distributed transaction processing in MANETs or other unreliable networks has to guarantee atomicity and isolation, a major challenge is how long-term blocking of resources can be avoided in case the mobile device looses connection to other participants of the transaction. We present a new technique for treating blocked data of transaction participants that wait for a coordinator’s com...

In distributed database systems (DDBSs), a transaction acquires the locks on the data objects during the execution and releases them only after the completion of commit processing. In DDBSs, it can be observed that, even though a transaction produces new data object values on completion of execution and these new data object values are not a ected during commit processing, the locks are release...

Workflow management systems (WFMS) coordinate execution of logically related multiple tasks in an organization. Such coordination is achieved through dependencies that are specified between the tasks of a workflow. Often times preventive measures are not enough and a workflow may be subjected to malicious attacks. Traditional workflow recovery mechanisms do not address how to recover from malic...

The information in the quarterly Aberdeen Housing Market Reports is based on transaction data provided by the Aberdeen Solicitor’s Property Centre (ASPC) to the Centre for Real Estate Research, University of Aberdeen. The data is used to compute quality-adjusted indices for different areas and different types of dwellings. Such indices control for the observed characteristics of the transacted ...

The Common Object Request Broker Architecture standardizes a platformand programming-language-independent distributed object computing environment. It also provides a standard for several distributed services. The Object Transaction Service provides an object-oriented framework for distributed transaction processing, especially for Online Transaction Processing in business applications. The cur...

Complex applications consist of a large set of transactions which are interrelated. There are different kinds of dependencies among transactions of a complex application, e.g. termination or execution dependencies which are constraints on the occurrence of significant transaction events. In this paper, we analyze a set of (orthogonal) transaction dependencies. Here, we do not follow traditional...

Multilevel transactions have been proposed for multilevel secure databases; in contrast to most proposals, such transactions allow users to read and write across multiple security levels. The security requirement that no high level operation in uence a low level operation often con icts with the atomicity requirement of the standard transaction processing model. In particular, others have shown...

Transaction-processing systems (TPS) are becoming increasingly more available as commercial products. However, the approaches to the issues associated with using TPS in multilevel secure environments are still in the research stage. In this article, we address the issues of multilevel security in distributed transaction-processing systems. A distributed transaction-processing system (DTPS) is a...