Manfred Reitenspieß – författare

Anwendungen wie "Electronic Commerce" oder Mobilkommunikation machen deutlich, dass das Thema IT-Sicherheit aktueller ist denn je. Die sorgfaltig ausgewahlten Beitrage der VIS '97 (5. Fachtagung der GI-Fachgruppe "Verlassliche IT-Systeme") bieten einen guten Uberblick nicht nur uber die technischen, sondern auch die organisatorischen, rechtlichen und politischen Rahmenbedingungen. Themen sind u. a. Copyright-Schutz digitaler Daten, Electronic Commerce, das Signaturgesetz, Systemschutz in offenen Netzen, Schutz von Kommunikationsinhalten und -beziehungen und Steganographie. Das Buch empfiehlt sich insbesondere fur IT-Verantwortliche in Unternehmen sowie Entwickler und Berater im Bereich IT-Sicherheit.

Database management systems are critical components of highly available appli- tions. To meet this need, many highly available database management systems have been developed. This paper describes the architectures that are internally used to construct these highly available databases. These architectures are examined from the perspective of both process redundancy and logical data redundancy. Process red- dancy is always required; it refers to the maintenance of redundant database processes that can take over in case of failure. Data redundancy is also required. Data red- dancy can be provided at either the physical or the logical level. Although both forms of data redundancy can provide high availability, this paper has concentrated on lo- cal data redundancy since that is a case where the database explicitly manages the data copies. We believe that process and data redundancy are useful means to describe the availability characteristics of these software systems. References 1. Application Interface Specification, SAI-AIS-A. 01. 01, April 2003. Service Availability Forum, available at www. saforum. org. 2. Gray, J. and Reuter, A.: Transaction Processing Systems, Concepts and Techniques. M- gan Kaufmann Publishers, 1992. 3. How MySQL Cluster Supports 99. 999% Availability. MySQL Cluster white paper, MySQL AB, 2004, available at http://www. mysql. com/cluster/. 4. Hu, K. , Mehrotra, S. , Kaplan, S. M. : Failure Handling in an Optimized Two-Safe Approach to Maintaining Primary-Backup Systems. Symposium on Reliable Distributed Systems 1998: 161-167. 5. Humborstad, R. , Sabaratnam, M. , Hvasshovd, S-O. , Torbjornsen, O.

This book constitutes the thoroughly refereed post-proceedings of the Third International Service Availability Symposium, ISAS 2006, held in Helsinki, Finland, in May 2006. The 19 revised full papers presented were carefully reviewed and selected from 38 submissions. The papers are organized in topical sections on availability modeling, estimation and analysis, dependability techniques and their applications, performability: measurements and assessments, service availability standards: experience reports and futures.

Program Chairs’ Message th The 4 International Service Availability Symposium (ISAS 2007) continued with the tradition of its predecessors by bringing together researchers and practitioners from both academia and industry to address the problems of service availability. The unique characteristic of a strong academic and industrial partnership was vividly - flected in this year’s event, from the Organizing Committee to the contributions and the participants. Recognizing the value of broadening the scope of ISAS 2007, we included new topic areas that cover model-driven design and human factors. We received a total of 25 submissions, each of which was thoroughly reviewed by at least three members of the Program Committee. Due to the limited time allocated for the symposium, many worthwhile manuscripts unfortunately did not make it into the final program. Our sincere thanks go to the Program Committee for conducting a vigorous review process in a rather tight time schedule. The detailed reviews and their generous comments have shaped the contributions into an excellent program.