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MANAGING TELEMETRY AS AN ENTERPRISE SOLUTION LEVERAGING TECHNOLOGY INTO NEXT-GENERATION TELEMETRY ARCHITECTURESYates, James William 10 1900 (has links)
International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California / With today’s rapidly shifting technology in the areas of networking, the Web, platform-independent software, and component technology, a paradigm shift will allow us to treat our telemetry systems as enterprise-wide solutions in the future. These technologies will revolutionize how we support all phases of telemetry data acquisition, processing, archiving, distribution, and display. This paper will explain how these changes affect systems designers, operators, and users. Specific technical areas of discussion include: § Technology adoption cycles § Object-oriented environments and component technologies § Database interconnectivity § Web-enabling concepts and implementations § Application servers § Database replication § Data warehousing § Embedded Web servers
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Virtual Full Replication for Scalable Distributed Real-Time DatabasesMathiason, Gunnar January 2009 (has links)
A fully replicated distributed real-time database provides high availability and predictable access times, independent of user location, since all the data is available at each node. However, full replication requires that all updates are replicated to every node, resulting in exponential growth of bandwidth and processing demands with the number of nodes and objects added. To eliminate this scalability problem, while retaining the advantages of full replication, this thesis explores Virtual Full Replication (ViFuR); a technique that gives database users a perception of using a fully replicated database while only replicating a subset of the data. We use ViFuR in a distributed main memory real-time database where timely transaction execution is required. ViFuR enables scalability by replicating only data used at the local nodes. Also, ViFuR enables flexibility by adaptively replicating the currently used data, effectively providing logical availability of all data objects. Hence, ViFuR substantially reduces the problem of non-scalable resource usage of full replication, while allowing timely execution and access to arbitrary data objects. In the thesis we pursue ViFuR by exploring the use of database segmentation. We give a scheme (ViFuR-S) for static segmentation of the database prior to execution, where access patterns are known a priori. We also give an adaptive scheme (ViFuR-A) that changes segmentation during execution to meet the evolving needs of database users. Further, we apply an extended approach of adaptive segmentation (ViFuR-ASN) in a wireless sensor network - a typical dynamic large-scale and resource-constrained environment. We use up to several hundreds of nodes and thousands of objects per node, and apply a typical periodic transaction workload with operation modes where the used data set changes dynamically. We show that when replacing full replication with ViFuR, resource usage scales linearly with the required number of concurrent replicas, rather than exponentially with the system size.
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Multi-Master Database Replication and e-Learning – Theoretical and Practical EvaluationHolmgren, Mattias January 2015 (has links)
Detta examensarbete har undersökt möjligheterna att kombinera multi-master databasreplikeringstekniker tillsammans med en LEMP-stack på små servrar för att öka tillgängligheten av e-Learning tjänster i avlägsna områden i Tanzania. Målet var att utvärdera kombinationen av Symmetric DS för databas synkronisering och kollitionsdetektering och resolution med e-Learning systemet Moodle. Detta gjordes genom att en litteraturstudie genomfördes och uppföjdes av implementation och konfiguration på plats i Tanzania. Slutsatsen var att de för projektet utvalda teknologierna, mjukvaran och hårdvaran var konfigurerbar i teorin men ohållbart kostsam att implementera i praktiken. / This research has investigated the possibility to combine multi-master database replication technologies together with a LEMP-stack on tiny servers to increase the availability of e-Learning services in remote areas in Tanzania. The aim was to evaluate the combination of Symmetric DS for multi master database replication and conflict detection and resolution with the e-learning system Moodle. This was done by conducting a literature study of relevant technologies followed by implementation and configuration at the location. The conclusion was that the technologies, software and hardware chosen for the project were configurable in theory but not viable to implement and maintain in practice.
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On the Consistency, Characterization, Adaptability and Integrity of Database Replication SystemsRuiz Fuertes, María Idoia 30 September 2011 (has links)
Desde la aparición de las primeras bases de datos distribuidas hasta los actuales sistemas de
replicación modernos, la comunidad de investigación ha propuesto múltiples protocolos para
administrar la distribución y replicación de datos, junto con algoritmos de control de concurrencia
para manejar las transacciones en ejecución en todos los nodos del sistema. Muchos protocolos están
disponibles, por tanto, cada uno con diferentes características y rendimiento, y garantizando
diferentes niveles de coherencia. Para saber qué protocolo de replicación es el más adecuado, dos
aspectos deben ser considerados: el nivel necesario de coherencia y aislamiento (es decir, el criterio
de corrección), y las propiedades del sistema (es decir, el escenario), que determinará el rendimiento
alcanzable.
Con relación a los criterios de corrección, la serialización de una copia es ampliamente aceptada
como el más alto nivel de corrección. Sin embargo, su definición permite diferentes interpretaciones
en cuanto a la coherencia de réplicas. En esta tesis se establece una correspondencia entre los modelos
de coherencia de memoria, tal como se definen en el ámbito de la memoria compartida distribuida, y
los posibles niveles de coherencia de réplicas, definiendo así nuevos criterios de corrección que
corresponden a las diferentes interpretaciones identificadas sobre la serialización de una copia.
Una vez seleccionado el criterio de corrección, el rendimiento alcanzable por un sistema depende en
gran medida del escenario, es decir, de la suma del entorno del sistema y de las aplicaciones que se
ejecutan en él. Para que el administrador pueda seleccionar un protocolo de replicación apropiado, los
protocolos disponibles deben conocerse plena y profundamente. Una buena descripción de cada
candidato es fundamental, pero un marco común es imperativo para comparar las diferentes opciones
y estimar su rendimiento en un escenario dado. Los resultados presentados en esta tesis cumplen los objetivos establecidos y
constituyen una contribución al estado del arte de la replicación de bases de datos
en el momento en que se iniciaron los trabajos respectivos. Estos resultados son
relevantes, además, porque abren la puerta a posibles contribuciones futuras. / Ruiz Fuertes, MI. (2011). On the Consistency, Characterization, Adaptability and Integrity of Database Replication Systems [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/11800 / Palancia
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Nástroj pro podporu obchodních procesů na mobilních platformách / Tool for Business Processes Support on Mobile PlatformsSvoboda, Roman January 2014 (has links)
The scope of this thesis is to design tools to support business processes on mobile platforms. The work deals with both the Enterprise Resource Planning systems issue, as well as the database synchronization and the possibilities of secure data transmission between the mobile device and the server. The work also includes familiarization with the most widely used mobile platforms and tools for multi-platform application development. The last part of the thesis comprises a model of an application meant to support business processes on mobile devices, including a description of its implementation, used tools and testing.
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