Masterarbeit aus dem Jahr 2016 im Fachbereich Informatik - Wirtschaftsinformatik, Note: 1,3, Friedrich-Schiller-Universität Jena, Sprache: Deutsch, Abstract: Wachsende Datenströme und die damit verbundene Herausforderung einer effizienten Verwaltung deuten darauf hin, dass auch Datenbankmanagementsysteme (DBMS) vor einer Revolution stehen. Tape is Dead, Disk is Tape, Flash is Disk, RAM Locality is King. So beschrieb Gray, Informatiker und Wissenschaftler bei Microsoft Research, die zunehmende Verschiebung der Speicherhierarchie. Haben traditionelle DBMS noch Sekundärspeicher unter entweder zeilen- oder spaltenorientierter Datenorganisation verwendet, gebrauchen In-Memory Datenbanken (IMDB) Hauptspeicher und eine primär spaltenorientierte Datenorganisation. Damit soll es in Echtzeit möglich sein zum einen große Datenmengen auswerten und zum anderen die Informationen zum Zeitpunkt des Entstehens verarbeiten zu können. Verhinderte in den Achtziger Jahren die starke Unzuverlässigkeit des Hauptspeichers und das hohe Preisniveau die Etablierung von IMDB, so ist es heute möglich den Einsatz in Datenbanken ökonomisch zu legitimieren.
Big Data ist heute eine der zentralen Entwicklungen im Datenbankbereich. Das Sonderheft von heise Develope stellt die theoretische Grundlagen dar, erklärt die wichtigsten Softwarelösungen von Apache Solr über Hadoop bis Elastic Search und geht der Frage nach, was diese Entwicklung für das Berufsbild des Informatikers bedeutet.
Follow this handbook to build, configure, tune, and secure Apache Cassandra databases. Start with the installation of Cassandra and move on to the creation of a single instance, and then a cluster of Cassandra databases. Cassandra is increasingly a key player in many big data environments, and this book shows you how to use Cassandra with Apache Spark, a popular big data processing framework. Also covered are day-to-day topics of importance such as the backup and recovery of Cassandra databases, using the right compression and compaction strategies, and loading and unloading data. Expert Apache Cassandra Administration provides numerous step-by-step examples starting with the basics of a Cassandra database, and going all the way through backup and recovery, performance optimization, and monitoring and securing the data. The book serves as an authoritative and comprehensive guide to the building and management of simple to complex Cassandra databases. The book: Takes you through building a Cassandra database from installation of the software and creation of a single database, through to complex clusters and data centers Provides numerous examples of actual commands in a real-life Cassandra environment that show how to confidently configure, manage, troubleshoot, and tune Cassandra databases Shows how to use the Cassandra configuration properties to build a highly stable, available, and secure Cassandra database that always operates at peak efficiency What Youll Learn Install the Cassandra software and create your first database Understand the Cassandra data model, and the internal architecture of a Cassandra database Create your own Cassandra cluster, step-by-step Run a Cassandra cluster on Docker Work with Apache Spark by connecting to a Cassandra database Deploy Cassandra clusters in your data center, or on Amazon EC2 instances Back up and restore mission-critical Cassandra databases Monitor, troubleshoot, and tune production Cassandra databases, and cut your spending on resources such as memory, servers, and storage Who This Book Is For Database administrators, developers, and architects who are looking for an authoritative and comprehensive single volume for all their Cassandra administration needs. Also for administrators who are tasked with setting up and maintaining highly reliable and high-performing Cassandra databases. An excellent choice for big data administrators, database administrators, architects, and developers who use Cassandra as their key data store, to support high volume online transactions, or as a decentralized, elastic data store. Sam Alapati is a Big Data Principal Administrator at Sabre, in Southlake, Texas, just outside Dallas. He has been working in the big data area for the past few years, after a long stint as an Oracle database administrator. Sam works with Apache Hadoop and Apache Spark, and now with Cassandra as part of his efforts to learn the role of NoSQL and other modern databases in the big data world. He has published several books on various areas of Oracle database administration, as well as a comprehensive handbook on administering Apache Hadoop.
This book presents in detail an alternative approach to solving problems involving both linear and nonlinear oscillations of elastic distributed parameter systems. It includes the so-called variational, projection and iterative gradient methods, which, when applied to nonlinear problems, use the procedure of linearization of the original non-linear equations. These methods are not universal and require a different solution for each problem or class of problems.However, in many cases the combination of the methods shown in this book leads to more efficient algorithms for solving important applied problems.To record these algorithms in a unified form, the first part of the book and its appendix devote considerable attention to compiling the general operator equations, which include (as particular cases) equations for vibrations in rods, plates, shells and three-dimensional bodies. They are mainly considered to be periodic or nearly periodic oscillations, which correspond to stationary or nearly stationary regimes of machinery operation. In turn, the second part of the book presents a number of solutions for selected applications. Fridman Vladimir Markovich was born on September 30, 1928 in Leningrad (St.Petersburg), USSR. In 1951 he graduated from the Physics and Mechanics Department of the Leningrad Polytechnic Institute (LPI). In 1964 he received a PhD degree in physics and mathematics, and in 1970 - Doctor of Sciences in Engineering. Since 1961 to 1993 - Research Fellow, Professor of LPI. At the same time, in parallel, from 1986 through 1996 - head of the laboratory at the Institute for Problems in Mechanical Engineering of the Academy of Sciences of the USSR and Russia. From 1951 to 1993 - head of the laboratory in the Electrical Machine Building company Electrosila (Electric power). In 1993 he immigrated to the USA. Since 1996 - Vice-President of the company Technical Mechanics and Electronics. Area of scientific interests: variational methods in the theory of elastic vibrations, calculation methods for dynamics of power machines. In total he has published more than 150 articles and has got more than 30 patents for inventions. Vladimir Fridman in 2014 published this monograph Theory of Elastic Oscillations in Russian language ( ?????? ??????? ????????? ). Sviyazheninov Eugene Dmitrievich was born on April 8, 1957 in Leningrad (St.Petersburg), USSR. In 1979 he graduated from the Physics and Mechanics Department of the Leningrad Polytechnic Institute (LPI). In 1985 he received a PhD degree in Engineering, and in 1970 - Doctor of Sciences in Engineering. Since 1979 to 1986 - Research Fellow of LPI. From 1986 through the present time - Leading Scientist at the Institute for Problems in Mechanical Engineering of the Academy of Sciences of the USSR and Russia. In 2001 he worked as a visiting Scientist at Ford Motor Company, Scientific Research Laboratory, Dearborn, USA. Area of scientific interests: research, development and inventory activities in mechanics, machinery, dynamics, vibration, noise, shock, impact, vibroisolation systems, constructions, automotive, electricity, electrodynamics, microwave electronics, acoustics, mechatronics. In total he has published more than 90 articles and has got more than 20 patents for inventions.
This book focuses on the mathematical potential and computational efficiency of the Boundary Element Method (BEM) for modeling seismic wave propagation in either continuous or discrete inhomogeneous elastic/viscoelastic, isotropic/anisotropic media containing multiple cavities, cracks, inclusions and surface topography. BEM models may take into account the entire seismic wave path from the seismic source through the geological deposits all the way up to the local site under consideration. The general presentation of the theoretical basis of elastodynamics for inhomogeneous and heterogeneous continua in the first part is followed by the analytical derivation of fundamental solutions and Greens functions for the governing field equations by the usage of Fourier and Radon transforms. The numerical implementation of the BEM is for antiplane in the second part as well as for plane strain boundary value problems in the third part. Verification studies and parametric analysis appear throughout the book, as do both recent references and seminal ones from the past. Since the background of the authors is in solid mechanics and mathematical physics, the presented BEM formulations are valid for many areas such as civil engineering, geophysics, material science and all others concerning elastic wave propagation through inhomogeneous and heterogeneous media. The material presented in this book is suitable for self-study. The book is written at a level suitable for advanced undergraduates or beginning graduate students in solid mechanics, computational mechanics and fracture mechanics.