Search For:

Displaying 1-48 out of 48 total
Operational Business Intelligence: Processing Mixed Workloads
Found in: IT Professional
By Michael Seibold,Dean Jacobs,Alfons Kemper
Issue Date:September 2013
pp. 16-21
Modern business applications have operational business intelligence features that require processing analytical queries and business transactions together at the same time and on the same data. This results in mixed workloads, which are a big challenge for...
 
CPU and cache efficient management of memory-resident databases
Found in: 2013 IEEE International Conference on Data Engineering (ICDE 2013)
By Holger Pirk,Florian Funke,Martin Grund,Thomas Neumann,Ulf Leser,Stefan Manegold,Alfons Kemper,Martin Kersten
Issue Date:April 2013
pp. 14-25
Memory-Resident Database Management Systems (MRDBMS) have to be optimized for two resources: CPU cycles and memory bandwidth. To optimize for bandwidth in mixed OLTP/OLAP scenarios, the hybrid or Partially Decomposed Storage Model (PDSM) has been proposed....
 
The adaptive radix tree: ARTful indexing for main-memory databases
Found in: 2013 IEEE International Conference on Data Engineering (ICDE 2013)
By Viktor Leis,Alfons Kemper,Thomas Neumann
Issue Date:April 2013
pp. 38-49
Main memory capacities have grown up to a point where most databases fit into RAM. For main-memory database systems, index structure performance is a critical bottleneck. Traditional in-memory data structures like balanced binary search trees are not effic...
 
Efficient Deployment of Main-Memory DBMS in Virtualized Data Centers
Found in: 2012 IEEE 5th International Conference on Cloud Computing (CLOUD)
By Michael Seibold,Andreas Wolke,Martina Albutiu,Martin Bichler,Alfons Kemper,Thomas Setzer
Issue Date:June 2012
pp. 311-318
Running emerging main-memory database systems within virtual machines causes huge overhead, because these systems are highly optimized to get the most out of bare metal servers. But running these systems on bare metal servers results in low resource utiliz...
 
Dynamic Load Balancing in Data Grids by Global Load Estimation
Found in: 2012 11th International Symposium on Parallel and Distributed Computing (ISPDC)
By Lukas Rupprecht,Angelika Reiser,Alfons Kemper
Issue Date:June 2012
pp. 243-250
Peer-to-Peer (P2P) technology can be utilized to combine remote resources and build distributed, high performance database systems, called data grids, which help to handle the rapidly increasing volumes of data produced by disciplines like astrophysics, bi...
 
Load Balancing in MapReduce Based on Scalable Cardinality Estimates
Found in: Data Engineering, International Conference on
By Benjamin Gufler,Nikolaus Augsten,Angelika Reiser,Alfons Kemper
Issue Date:April 2012
pp. 522-533
MapReduce has emerged as a popular tool for distributed and scalable processing of massive data sets and is being used increasingly in e-science applications. Unfortunately, the performance of MapReduce systems strongly depends on an even data distribution...
 
Strict SLAs for Operational Business Intelligence
Found in: Cloud Computing, IEEE International Conference on
By Michael Seibold,Alfons Kemper,Dean Jacobs
Issue Date:July 2011
pp. 25-32
Today, SLAs for SaaS business applications usually lack stringent service level objectives and significant penalties. Moreover, Operational Business Intelligence features of modern business applications, like analytic dashboards, result in mixed workloads ...
 
Extensibility and Data Sharing in evolving multi-tenant databases
Found in: Data Engineering, International Conference on
By Stefan Aulbach,Michael Seibold,Dean Jacobs,Alfons Kemper
Issue Date:April 2011
pp. 99-110
Software-as-a-Service applications commonly consolidate multiple businesses into the same database to reduce costs. This practice makes it harder to implement several essential features of enterprise applications. The first is support for master data, whic...
 
HyPer: A hybrid OLTP&OLAP main memory database system based on virtual memory snapshots
Found in: Data Engineering, International Conference on
By Alfons Kemper,Thomas Neumann
Issue Date:April 2011
pp. 195-206
The two areas of online transaction processing (OLTP) and online analytical processing (OLAP) present different challenges for database architectures. Currently, customers with high rates of mission-critical transactions have split their data into two sepa...
 
Model-Based Planning for State-Related Changes to Infrastructure and Software as a Service Instances in Large Data Centers
Found in: Cloud Computing, IEEE International Conference on
By Sebastian Hagen, Alfons Kemper
Issue Date:July 2010
pp. 11-18
To deliver 3-tier applications as a Service in the Cloud state-related constraints crossing Infrastructure- and Software as a Service boundaries need to be managed. By automating the lifecycle of applications like databases, load balancers, and web applica...
 
Service Migration Scenarios for Embedded Networks
Found in: Advanced Information Networking and Applications Workshops, International Conference on
By Stephan Sommer, Andreas Scholz, Irina Gaponova, Alois Knoll, Alfons Kemper, Christian Buckl, Gerd Kainz, Jörg Heuer, Anton Schmitt
Issue Date:April 2010
pp. 502-507
More and more devices are becoming network enabled and are integrated within one large, distributed system. The service-oriented paradigm is the predominant concept for the implementation of this approach and helps to deal with heterogeneous network infras...
 
Services to the Field: An Approach for Resource Constrained Sensor/Actor Networks
Found in: Advanced Information Networking and Applications Workshops, International Conference on
By Christian Buckl, Stephan Sommer, Andreas Scholz, Alois Knoll, Alfons Kemper, Jörg Heuer, Anton Schmitt
Issue Date:May 2009
pp. 476-481
More and more devices become network enabled and are integrated within one large, distributed system. The serviceoriented paradigm is the main concept to implement this approachand to cope with the heterogeneity of the underlying network. However, resource...
 
Generating a Tailored Middleware for Wireless Sensor Network Applications
Found in: Sensor Networks, Ubiquitous, and Trustworthy Computing, International Conference on
By Christian Buckl, Stephan Sommer, Andreas Scholz, Alois Knoll, Alfons Kemper
Issue Date:June 2008
pp. 162-169
Wireless sensor networks are characterized by resource constraints. Therefore, today's sensor networks are implemented from scratch emphasizing code efficiency. This development strategy leads to relatively complex code and bad code reusability in further ...
 
WS-AMUSE - web service architecture for multimedia services
Found in: Software Engineering, International Conference on
By Andreas Scholz, Christian Buckl, Alfons Kemper, Alois Knoll, Jörg Heuer, Martin Winter
Issue Date:May 2008
pp. 703-712
Recently, a move from traditional, network specific multimedia services to IP-based solutions could be observed. Although many of these applications have similar requirements and address the same issues, individual solutions based on specialized protocols ...
 
Community Training: Partitioning Schemes in Good Shape for Federated Data Grids
Found in: e-Science and Grid Computing, International Conference on
By Tobias Scholl, Richard Kuntschke, Angelika Reiser, Alfons Kemper
Issue Date:December 2007
pp. 195-203
In federated Data Grids, individual institutions share their data sets within a community to enable collaborative data analysis. Data access needs to be provided in a scalable fashion since in most e-science communities, data sets do not only grow exponent...
 
Workload Analysis and Demand Prediction of Enterprise Data Center Applications
Found in: IEEE Workload Characterization Symposium
By Daniel Gmach, Jerry Rolia, Ludmila Cherkasova, Alfons Kemper
Issue Date:September 2007
pp. 171-180
Advances in virtualization technology are enabling the creation of resource pools of servers that permit multiple application workloads to share each server in the pool. Understanding the nature of enterprise workloads is crucial to properly designing and ...
 
Grid-Based Data Stream Processing in e-Science
Found in: e-Science and Grid Computing, International Conference on
By Richard Kuntschke, Tobias Scholl, Sebastian Huber, Alfons Kemper, Angelika Reiser, Hans-Martin Adorf, Gerard Lemson, Wolfgang Voges
Issue Date:December 2006
pp. 30
The field of e-science currently faces many challenges. Among the most important ones are the analysis of huge volumes of scientific data and the connection of various sciences and communities, thus enabling scientists to share scientific interests, data, ...
 
Evaluation of Adaptive Computing Concepts for Classical ERP Systems and Enterprise Services
Found in: E-Commerce Technology, IEEE International Conference on, and Enterprise Computing, E-Commerce, and E-Services, IEEE International Conference on
By Martin Wimmer, Valentin Nicolescu, Daniel Gmach, Matthias Mohr, Alfons Kemper, Helmut Krcmar
Issue Date:June 2006
pp. 48
To ensure the operability and reliability of large scale Enterprise Resource Planning Systems (ERP), a peak-load oriented hardware sizing is often used. Better utilization can be achieved by employing an adaptive infrastructure based on smaller computation...
 
AutoGlobe: An Automatic Administration Concept for Service-Oriented Database Applications
Found in: Data Engineering, International Conference on
By Stefan Seltzsam, Daniel Gmach, Stefan Krompass, Alfons Kemper
Issue Date:April 2006
pp. 90
Future database application systems will be designed as Service Oriented Architectures (SOAs) like SAP?s NetWeaver instead of monolithic software systems such as SAP?s R/3. The decomposition in finer-grained services allows the usage of hardware clusters a...
 
Dynamic Extensible Query Processing in Super-Peer Based P2P Systems
Found in: Data Engineering, International Conference on
By Christian Wiesner, Alfons Kemper, Stefan Brandl
Issue Date:April 2004
pp. 848
No summary available.
   
Benchmarking SAP R/3 Archiving Scenarios
Found in: Data Engineering, International Conference on
By Bernhard Zeller, Alfons Kemper
Issue Date:April 2004
pp. 782
According to a survey of the University of Berkeley, about 5 Exabytes of new information has been created in 2002. This information explosion affects also the database volumes of enterprise resource planning (ERP) systems like SAP R/3, the market leader fo...
 
Integrating Semi-Join-Reducers into State-of-the-Art Query Processors
Found in: Data Engineering, International Conference on
By Konrad Stocker, Reinhard Braumandl, Alfons Kemper, Donald Kossmann
Issue Date:April 2001
pp. 0575
Abstract: Semi-join reducers were introduced in the late seventies as a means to reduce the communication costs of distributed database systems. Subsequent work in the eighties showed, however, that semi-join reducers are rarely beneficial for the distribu...
 
Optimization and Evaluation of Disjunctive Queries
Found in: IEEE Transactions on Knowledge and Data Engineering
By Jens Claussen, Alfons Kemper, Guido Moerkotte, Klaus Peithner, Michael Steinbrunn
Issue Date:March 2000
pp. 238-260
<p><b>Abstract</b>—It is striking that the optimization of disjunctive queries—i.e., those which contain at least one <b>or</b>-connective in the query predicate—has been vastly neglected in the literature, as well as in comme...
 
Locality-sensitive operators for parallel main-memory database clusters
Found in: 2014 IEEE 30th International Conference on Data Engineering (ICDE)
By Wolf Rodiger,Tobias Muhlbauer,Philipp Unterbrunner,Angelika Reiser,Alfons Kemper,Thomas Neumann
Issue Date:March 2014
pp. 592-603
The growth in compute speed has outpaced the growth in network bandwidth over the last decades. This has led to an increasing performance gap between local and distributed processing. A parallel database cluster thus has to maximize the locality of query p...
   
Main-memory database systems
Found in: 2014 IEEE 30th International Conference on Data Engineering (ICDE)
By Alfons Kemper,Thomas Neumann
Issue Date:March 2014
pp. 1310
The recent advances in processor technology - soon hundreds of cores and terabytes of DRAM in commodity servers - have spawned the academic as well as the industrial interest in main-memory database technology. In this panel, we will discuss the virtues of...
   
Exploiting hardware transactional memory in main-memory databases
Found in: 2014 IEEE 30th International Conference on Data Engineering (ICDE)
By Viktor Leis,Alfons Kemper,Thomas Neumann
Issue Date:March 2014
pp. 580-591
So far, transactional memory—although a promising technique—suffered from the absence of an efficient hardware implementation. The upcoming Haswell microarchitecture from Intel introduces hardware transactional memory (HTM) in mainstream CPUs. HTM allows f...
   
A Publish & Subscribe Architecture for Distributed Metadata Management
Found in: Data Engineering, International Conference on
By Markus Keidl, Alexander Kreutz, Alfons Kemper, Donald Kossmann
Issue Date:March 2002
pp. 0309
The emergence of electronic marketplaces and other electronic services and applications on the Internet is creating a growing demand for effective management of resources. Due to the nature of the Internet such information changes rapidly. Furthermore, suc...
 
RWS-Diff: flexible and efficient change detection in hierarchical data
Found in: Proceedings of the 22nd ACM international conference on Conference on information & knowledge management (CIKM '13)
By Nikolaus Augsten, Alfons Kemper, Franz Färber, Jan P. Finis, Martin Raiber, Robert Brunel
Issue Date:October 2013
pp. 339-348
The problem of generating a cost-minimal edit script between two trees has many important applications. However, finding such a cost-minimal script is computationally hard, thus the only methods that scale are approximate ones. Various approximate solution...
     
How to efficiently snapshot transactional data: hardware or software controlled?
Found in: Proceedings of the Seventh International Workshop on Data Management on New Hardware (DaMoN '11)
By Alfons Kemper, Henrik Muhe, Thomas Neumann
Issue Date:June 2011
pp. 17-26
The quest for real-time business intelligence requires executing mixed transaction and query processing workloads on the same current database state. However, as Harizopoulos et al. [6] showed for transactional processing, co-execution using classical conc...
     
The mixed workload CH-benCHmark
Found in: Proceedings of the Fourth International Workshop on Testing Database Systems (DBTest '11)
By Alfons Kemper, Eric Simon, Florian Funke, Florian Waas, Harumi Kuno, Kai-Uwe Sattler, Leo Giakoumakis, Meikel Poess, Michael Seibold, Raghunath Nambiar, Richard Cole, Stefan Krompass, Thomas Neumann, Wey Guy
Issue Date:June 2011
pp. 1-6
While standardized and widely used benchmarks address either operational or real-time Business Intelligence (BI) workloads, the lack of a hybrid benchmark led us to the definition of a new, complex, mixed workload benchmark, called mixed workload CH-benCHm...
     
Tractor pulling on data warehouses
Found in: Proceedings of the Fourth International Workshop on Testing Database Systems (DBTest '11)
By Alfons Kemper, Anisoara Nica, Kai-Uwe Sattler, Martin L. Kersten, Meikel Poess, Volker Markl
Issue Date:June 2011
pp. 1-6
Robustness of database systems under stress is hard to quantify, because there are many factors involved, most notably the user expectation to perform a job within certain bounds of the user requirements. Nevertheless, robustness of database system is very...
     
Adaptive query scheduling for mixed database workloads with multiple objectives
Found in: Proceedings of the Third International Workshop on Testing Database Systems (DBTest '10)
By Alfons Kemper, Harumi Kuno, Kevin Wilkinson, Stefan Krompass, Umeshwar Dayal
Issue Date:June 2010
pp. 1-6
Ideally, a data warehouse would be able to run multiple types of queries concurrently, meeting different performance objectives for each type. However, due to the difficulty of managing mixed workloads, most commercial systems segregate distinct workload c...
     
Towards an adaptive execution of applications in heterogeneous embedded networks
Found in: Proceedings of the 2010 ICSE Workshop on Software Engineering for Sensor Network Applications (SESENA '10)
By Alfons Kemper, Alois Knoll, Andreas Scholz, Anton Schmitt, Christian Buckl, Gerd Kainz, Jorg Heuer, Stephan Sommer
Issue Date:May 2010
pp. 26-31
Embedded networks are emerging in many application fields, such as the automotive or building and factory automation sector. Compared to other distributed systems, embedded networks offer a new challenge for developers: heterogencity and resource constrain...
     
A comparison of flexible schemas for software as a service
Found in: Proceedings of the 35th SIGMOD international conference on Management of data (SIGMOD '09)
By Alfons Kemper, Dean Jacobs, Michael Seibold, Stefan Aulbach
Issue Date:June 2009
pp. 3-4
A multi-tenant database system for Software as a Service (SaaS) should offer schemas that are flexible in that they can be extended different versions of the application and dynamically modified while the system is on-line. This paper presents an experimen...
     
Collaborative query coordination in community-driven data grids
Found in: Proceedings of the 18th ACM international symposium on High performance distributed computing (HPDC '09)
By Alfons Kemper, Angelika Reiser, Tobias Scholl
Issue Date:June 2009
pp. 151-166
E-science communities face huge data management challenges due to large existing data sets and expected data rates from forthcoming projects. Community-driven data grids provide a scalable, high-throughput oriented data management solution for scientific f...
     
Managing long-running queries
Found in: Proceedings of the 12th International Conference on Extending Database Technology: Advances in Database Technology (EDBT '09)
By Alfons Kemper, Harumi Kuno, Janet L. Wiener, Kevin Wilkinson, Stefan Krompass, Umeshwar Dayal
Issue Date:March 2009
pp. 94-104
Business Intelligence query workloads that run against very large data warehouses contain queries whose execution times range, sometimes unpredictably, from seconds to hours. The presence of even a handful of long-running queries can significantly slow dow...
     
Workload-aware data partitioning in community-driven data grids
Found in: Proceedings of the 12th International Conference on Extending Database Technology: Advances in Database Technology (EDBT '09)
By Alfons Kemper, Angelika Reiser, Benjamin Gufler, Bernhard Bauer, Jessica Muller, Tobias Scholl
Issue Date:March 2009
pp. 94-104
Collaborative research in various scientific disciplines requires support for scalable data management enabling the efficient correlation of globally distributed data sources. Motivated by the expected data rates of upcoming projects and a growing number o...
     
Multi-tenant databases for software as a service: schema-mapping techniques
Found in: Proceedings of the 2008 ACM SIGMOD international conference on Management of data (SIGMOD '08)
By Alfons Kemper, Dean Jacobs, Jan Rittinger, Stefan Aulbach, Torsten Grust
Issue Date:June 2008
pp. 13-14
In the implementation of hosted business services, multiple tenants are often consolidated into the same database to reduce total cost of ownership. Common practice is to map multiple single-tenant logical schemas in the application to one multi-tenant phy...
     
WS-AMUSE - web service architecture for multimedia services
Found in: Proceedings of the 13th international conference on Software engineering (ICSE '08)
By Alfons Kemper, Alois Knoll, Andreas Scholz, Christian Buckl, Jorg Heuer, Martin Winter
Issue Date:May 2008
pp. 1-1
Recently, a move from traditional, network specific multimedia services to IP-based solutions could be observed. Although many of these applications have similar requirements and address the same issues, individual solutions based on specialized protocols ...
     
Adaptive quality of service management for enterprise services
Found in: ACM Transactions on the Web (TWEB)
By Alfons Kemper
Issue Date:February 2008
pp. 1-46
In the past, enterprise resource planning systems were designed as monolithic software systems running on centralized mainframes. Today, these systems are (re-)designed as a repository of enterprise services that are distributed throughout the available co...
     
StreamGlobe: adaptive query processing and optimization in streaming P2P environments
Found in: Proceeedings of the 1st international workshop on Data management for sensor networks: in conjunction with VLDB 2004 (DMSN '04)
By Alfons Kemper, Bernhard Stegmaier, Richard Kuntschke
Issue Date:August 2004
pp. 88-97
Recent research and development efforts show the increasing importance of processing data streams, not only in the context of sensor networks, but also in information retrieval networks. With the advent of various mobile devices being able to participate i...
     
Towards context-aware adaptable web services
Found in: Proceedings of the 13th international World Wide Web conference on Alternate track papers & posters (WWW Alt. '04)
By Alfons Kemper, Markus Keidl
Issue Date:May 2004
pp. 55-65
In this paper, we present a context framework that facilitates the development and deployment of context-aware adaptable Web services. Web services are provided with context information about clients that may be utilized to provide a personalized behavior....
     
Database patchwork on the Internet
Found in: Proceedings of the 1999 ACM SIGMOD international conference on Management of data (SIGMOD '99)
By Alfons Kemper, Donald Kossmann, Reinhard Braumandl
Issue Date:May 1999
pp. 358-367
Naturally, data processing requires three kinds of resources:the data itself,the functionality (i.e. database operations) andthe machines on which to run the operations.Because of the Internet we believe that in the long run there will be alternative provi...
     
SAP R/3 (tutorial): a database application system
Found in: Proceedings of the 1998 ACM SIGMOD international conference on Management of data (SIGMOD '98)
By Alfons Kemper, Donald Kossmann, Florian Matthes
Issue Date:June 1998
pp. 227-234
Many database applications in the real world are no longer built on top of a stand-alone database system. Rather, generic (standard) application systems are employed in which the database system is one integrated component. SAP is the market leader for int...
     
Database performance in the real world: TPC-D and SAP R/3
Found in: Proceedings of the 1997 ACM SIGMOD international conference on Management of data (SIGMOD '97)
By Alfons Kemper, Donald Kossmann, Joachen Doppelhammer, Thomas Hoppler
Issue Date:May 1997
pp. 79
Traditionally, database systems have been evaluated in isolation on the basis of standardized benchmarks (e.g., Wisconsin, TPC-C, TPC-D). We argue that very often such a performance analysis does not reflect the actual use of the DBMSs in the “real w...
     
Function materialization in object bases
Found in: Proceedings of the 1991 ACM SIGMOD international conference on Management of data (SIGMOD '91)
By Alfons Kemper, Christoph Kilger, Guido Moerkotte
Issue Date:May 1991
pp. 328-340
Iris is an object-oriented database management system being developed at Hewlett-Packard Laboratories [1], [3]. This videotape provides an overview of the Iris data model and a summary of our experiences in converting a computer-integrated manufacturing ap...
     
An object-oriented system for engineering applications
Found in: Proceedings of the 1987 ACM SIGMOD international conference on Management of data (SIGMOD '87)
By Alfons Kemper, Mechtild Wallrath, Peter C. Lockemann
Issue Date:May 1987
pp. 349-362
One of the most promising approaches to database support of engineering applications is the concept of object-oriented database management. Object-orientation is usually approached from either a behavioral or structural viewpoint. The former emphasizes the...
     
Application generators: Ideas for programming language extensions
Found in: Proceedings of the 1984 annual conference of the ACM on The fifth generation challenge (ACM 84)
By Alfons Kemper, Balaji Narasimhan, Ellis Horowitz
Issue Date:January 1984
pp. 94-101
The continued development of higher order programming languages has not yielded major productivity improvements in the software development process. One often mentioned mechanism for achieving significant orders of improvement are application generators, s...
     
 1