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Transaction processing is of growing importance for mobile computing. Booking tickets, flight reservation, banking, ePayment, and booking holiday arrangements are just a few examples for mobile transactions. Due to temporarily disconnected situations the synchronisation and consistent transaction processing are key issues. Serializability is a too strong criteria for correctness when the semantics of a transaction is known. We introduce a transaction model that allows higher concurrency for a certain class of transactions defined by its semantic. The transaction results are ”escrow serializable” and the synchronisation mechanism is non-blocking. Experimental implementation showed higher concurrency, transaction throughput, and less resources used than common locking or optimistic protocols.
Erfolg durch Kooperation
(2009)
Modern web-based applications are often built as multi-tier architecture using persistence middleware. Middleware technology providers recommend the use of Optimistic Concurrency Control (OCC) mechanism to avoid the risk of blocked resources. However, most vendors of relational database management systems implement only locking schemes for concurrency control. As consequence a kind of OCC has to be implemented at client or middleware side.
A simple Row Version Verification (RVV) mechanism has been proposed to implement an OCC at client side. For performance reasons the middleware uses buffers (cache) of its own to avoid network traffic and possible disk I/O. This caching however complicates the use of RVV because the data in the middleware cache may be stale (outdated). We investigate various data access technologies, including the new Java Persistence API (JPA) and Microsoft’s LINQ technologies for their ability to use the RVV programming discipline.
The use of persistence middleware that tries to relieve the programmer from the low level transaction programming turns out to even complicate the situation in some cases.Programmed examples show how to use SQL data access patterns to solve the problem.
In this presentation the audience will be: (a) introduced to the aims and objectives of the DBTechNet initiative, (b) briefed on the DBTech EXT virtual laboratory workshops (VLW), i.e. the educational and training (E&T) content which is freely available over the internet and includes vendor-neutral hands-on laboratory training sessions on key database technology topics, and (c) informed on some of the practical problems encountered and the way they have been addressed. Last but not least, the audience will be invited to consider incorporating some or all of the DBTech EXT VLW content into their higher education (HE), vocational education and training (VET), and/or lifelong learning/training type course curricula. This will come at no cost and no commitment on behalf of the teacher/trainer; the latter is only expected to provide his/her feedback on the pedagogical value and the quality of the E&T content received/used.
Relationship Marketing (RM) presumes trust as an important antecedent for the performance of interfirm relationships. Current research is dominated by an interpersonal perspective. In this research tack, trust chiefly emerges as a result of interpersonal relationships. But multiple risks arise if customer trust rests solely on elements inextricably linked to single representatives. Hence, this paper evaluates the impact of organizational capabilities and the moderating role of customer preferences on the trust creation process. The framework presented here is tested cross-industry on 220 customers for IT solutions. The results offer significant insight into the effectiveness of individual and organizational RM strategies.
Vertrauen ist eine wesentliche Ressource für die Zusammenarbeit zwischen Anbietern und Kunden. In der postmodernen Gesellschaft sind beide Seiten auf Kooperation angewiesen. Ohne Vertrauen führen gemeinsame Beziehungen jedoch selten zu den erwünschten Resultaten. Alexander Rossmann zeigt auf, wie sich das Vertrauen von Kunden stimulieren lässt und welche Verhaltensweisen zu vermeiden sind. Dabei werden personale und organisationale Vertrauensstrategien konzeptionell entwickelt und am Beispiel der IT-Branche empirisch untersucht. Eine Analyse der Auswirkungen von Vertrauen bietet differenzierte Einblicke in die Chancen und Risiken von Vertrauen aus Anbieter- und Kundenperspektive.
This work presents a disconnected transaction model able to cope with the increased complexity of longliving, hierarchically structured, and disconnected transactions. Wecombine an Open and Closed Nested Transaction Model with Optimistic Concurrency Control and interrelate flat transactions with the aforementioned complex nature. Despite temporary inconsistencies during a transaction’s execution our model ensures consistency.
Social Media
(2011)
In jüngerer Zeit gewinnt die Nutzung des Internet für das Inbound Marketing zunehmend an Bedeutung. Dabei liegt der Fokus auf den so genannten Social Media Plattformen wie Facebook, YouTube, MySpace, XING, LinkedIn, Twitter, SlideShare und Posterous. Die Entwicklung dieser Medien ist auf eine Veränderung bei der Nutzung des Internet zurückzuführen, die häufig unter dem Schlagwort Web 2.0 zusammengefasst wird. Das gewandelte Mediennutzungsverhalten der Kunden induziert Chancen und Risiken für das Marketing.