Auflistung nach Autor:in "Freytag, Johann-Christoph"
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- KonferenzbeitragAnforderungen an Datenbanksysteme für Multi-Tenancy- und Software-as-a-Service-Applikationen(Datenbanksysteme in Business, Technologie und Web (BTW) – 13. Fachtagung des GI-Fachbereichs "Datenbanken und Informationssysteme" (DBIS), 2009) Aulbach, Stefan; Jacobs, Dean; Primsch, Jürgen; Kemper, AlfonsFür Multi-Tenancy-Applikationen und Software as a Service (SaaS) stellen sich konventionelle Datenbanksysteme oftmals als ungeeignet heraus. In einem solchen Umfeld müssen Anforderungen, wie Erweiterbarkeit und Verfügbarkeit, trotz geringer Kosten für den
- KonferenzbeitragAn architecture for integrated operational business intelligence(Datenbanksysteme in Business, Technologie und Web (BTW) – 13. Fachtagung des GI-Fachbereichs "Datenbanken und Informationssysteme" (DBIS), 2009) Christ, UlrichIn recent years, Operational Business Intelligence has emerged as an important trend in the Business Intelligence (BI) market. While sharing some obvious features with "traditional" data warehouse based BI, some of the requirements for the operational fla
- KonferenzbeitragATE: Workload-oriented DB2 tuning in action(Datenbanksysteme in Business, Technologie und Web (BTW) – 13. Fachtagung des GI-Fachbereichs "Datenbanken und Informationssysteme" (DBIS), 2009) Wiese, David; Rabinovitch, Gennadi; Reichert, Michael; Arenswald, Stephan
- KonferenzbeitragA Bayesian approach to estimating the selectivity of conjunctive predicates(Datenbanksysteme in Business, Technologie und Web (BTW) – 13. Fachtagung des GI-Fachbereichs "Datenbanken und Informationssysteme" (DBIS), 2009) Heimel, Max; Markl, Volker; Murthy, KeshavaCost-based optimizers in relational databases make use of data statistics to estimate intermediate result cardinalities. Those cardinalities are needed to estimate access plan costs in order to choose the cheapest plan for executing a query. Since statist
- KonferenzbeitragBridging the gap between variability in client application and database schema(Datenbanksysteme in Business, Technologie und Web (BTW) – 13. Fachtagung des GI-Fachbereichs "Datenbanken und Informationssysteme" (DBIS), 2009) Siegmund, Norbert; Kästner, Christian; Rosenmüller, Marko; Heidenreich, Florian; Apel, Sven; Saake, GunterDatabase schemas are used to describe the logical design of a database. Diverse groups of users have different views on the global schema which leads to different local schemas. Research has focused on view integration to generate a global, consistent sch
- KonferenzbeitragBringing BLINK closer to the full power of SQL(Datenbanksysteme in Business, Technologie und Web (BTW) – 13. Fachtagung des GI-Fachbereichs "Datenbanken und Informationssysteme" (DBIS), 2009) Stolze, Knut; Raman, Vijayshankar; Sidle, Richard; Draese, OliverBLINK is a prototype of an in-memory based query processor that exploits heavily the underlying CPU infrastructure. It is very sensitive to the processor's caches and instruction set. In this paper, we describe how to close two major functional gaps in BL
- KonferenzbeitragBuilding chemical information systems – the ViFaChem II project(Datenbanksysteme in Business, Technologie und Web (BTW) – 13. Fachtagung des GI-Fachbereichs "Datenbanken und Informationssysteme" (DBIS), 2009) Tönnies, Sascha; Köhncke, Benjamin; Koepler, Oliver; Balke, Wolf -TiloThe interdisciplinary ViFaChem II project aims at providing a chemical digital library infrastructure for creating personalized information spaces. The value added services and scientific Web 2.0 techniques actively support chemical scientists and researc
- KonferenzbeitragContinuous queries over data streams – Semantics and implementation(Datenbanksysteme in Business, Technologie und Web (BTW) – 13. Fachtagung des GI-Fachbereichs "Datenbanken und Informationssysteme" (DBIS), 2009) Krämer, JürgenRecent technological advances have pushed the emergence of a new class of data-intensive applications that require continuous processing over sequences of transient data, called data streams, in near real-time. Examples of such applications range from bus
- KonferenzbeitragD2Pt: Privacy-Aware Multiparty Data Publication(Datenbanksysteme für Business, Technologie und Web (BTW 2015), 2015) Nielsen, Jan Hendrik; Janusz, Daniel; Taeschner, Jochen; Freytag, Johann-ChristophToday, publication of medical data faces high legal barriers. On the one hand, publishing medical data is important for medical research. On the other hand, it is neccessary to protect peoples' privacy by ensuring that the relationship between individuals and their related medical data remains unknown to third parties. Various data anonymization techniques remove as little identifying information as possible to maintain a high data utility while satisfying the strict demands of privacy laws. Current research in this area proposes a multitude of concepts for data anonymization. The concept of k-anonymity allows data publication by hiding identifying information without losing its semantics. Based on k-anonymity, the concept of t-closeness incorporates semantic relationships between personal data values, therefore increasing the strength of the anonymization. However, these concepts are restricted to a centralized data source. In this paper, we extend existing data privacy mechanisms to enable joint data publication among multiple participating institutions. In particular, we adapt the concept of t-closeness for distributed data anonymization. We introduce Distributed two-Party t-closeness (D2Pt), a protocol that utilizes cryptographic algorithms to avoid a central component when anonymizing data adhering the t-closeness property. That is, without a trusted third party, we achieve a data privacy based on the notion of t-closeness.