Industrial SponsorsFOREWARD Objective (2009)
Qiong Luo, Kenneth A. Ross, Peter Boncz, Shimin Chen, Goetz Graefe, Stavros Harizopoulos, ...
The aim of this one-day workshop is to bring together researchers who are interested in optimizing database performance on modern computing infrastructure by designing new data management techniques...
The Complexity of Transformation-Based Join Enumeration (2009)
Arjan Pellenkoftt, Martin Kersten
Query optimizers that explore a search space exhaustively using transformation rules usually apply all possible rules on each alternative, and stop when no new information is produced. A memoizing...
Armada: a Reference Model for an Evolving Database System (2009)
Fabian Groffen, Martin Kersten, Stefan Manegold
Abstract: The data on the web, in digital libraries, in scientific repositories, etc. continues to grow at an increasing rate. Distribution is a key solution to overcome this data explosion. However,...
DESCRIPTORS Architecture (computers) Data processing (2008)
Sunil Choenni, Martin Kersten, Sunil Choenni, Martin Kersten
Algorithms Information retrieval Computerized simulation Information systems Data base management systems Optimization Data bases Query languages In some key database applications, a sequence of...
Distribution Rules for Array Database Queries Alex van Ballegooij, Roberto (2008)
Abstract. Non-trivial retrieval applications involve complex computations on large multi-dimensional datasets. These should, in principle, benefit from the use of relational database technology....
Information access in multimedia databases based on feature models (2008)
Menzo Windhouwer, Menzo Windhouwer, Peter Apers, ...
Abstract With the increasing popularity of the WWW, the main challenge in computer science has become content-based retrieval of multimedia objects. Access to multimedia objects in databases has long...
Exact matching in image databases (2008)
Peter Bosch, Alex Van Ballegooij, Martin Kersten
We believe there is a niche for exact sub-image searching in image databases. When only a sub-image is searched for, traditional image searching approaches fail because the sub-image features usually...
Menzo Windhouwer, Albrecht Schmidt, Martin Kersten
In this paper, we present a system that combines independent feature detector programs with multimedia database technology to provide a semantic rich index to multimedia data items on the World Wide...
The Complexity of Transformation-Based Join Enumeration (2008)
Arjan Pellenkoftt, Martin Kersten
Query optimizers that explore a search space exhaustively using transformation rules usu-ally apply all possible rules on each alterna-tive, and stop when no new information is pro-duced. A memoizing...
A Perspective on Databases and Data Mining (2007)
Data Mining, M. Holsheimer, M. Kersten, H. Mannila, H. Toivonen, Issn -x, ...
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
Cooperative Systems Supported by Active Database Technology (2007)
Rapid changing business processes need an IT infrastructure that supports the cooperation of applications that are located in separated business units. This paper explores the opportunity of...
M. L. Kersten, Alex Van Ballegooij, Martin Kersten
CWI is a founding member of ERCIM, the European Research Consortium for Informatics and Mathematics. CWI's research has a theme-oriented structure and is grouped into four clusters. Listed below...
Cost Distributions of Search Spaces in Query Optimization (2007)
J. Pellenkoft, M. L. Kersten, Arjan Pellenkoft, Martin Kersten
Query optimization algorithms explore a large space of query execution plans looking for an optimal solution. The predominant algorithms move around the search space in either a deterministic or...
Cracking the Database Store (2005)
Martin Kersten, Stefan Manegold
Query performance strongly depends on finding an execution plan that touches as few superfluous tuples as possible. The access structures deployed for this purpose, however, are non-discriminative....
Cracking the Database Store (2005)
M. L. Kersten, S. Manegold, Martin Kersten, Stefan Manegold
CWI is a founding member of ERCIM, the European Research Consortium for Informatics and Mathematics. CWI's research has a theme-oriented structure and is grouped into four clusters. Listed below...
Cache-Conscious Radix-Decluster Projections (2004)
Stefan Manegold, Peter Boncz, Niels Nes, Martin Kersten
As CPUs become more powerful with Moore’s law and memory latencies stay constant, the impact of the memory access performance bottleneck continues to grow on relational operators like join, which...
The Lowell Database Research Self Assessment (2003)
Abiteboul, Serge, Agrawal, Rakesh, Bernstein, Phil, Carey, Mike, Ceri, Stefano, Croft, Bruce, ...
A group of senior database researchers gathers every few years to assess the state of database research and to point out problem areas that deserve additional focus. This report summarizes the...
A Database Striptease or How to Manage Your Personal Databases (2003)
Kersten, Martin, Weikum, Gerhard, Franklin, Michael, Keim, Daniel A., Buchmann, Alex, Chaudhuri, Surajit
Serge Abiteboul, Rakesh Agrawal, Phil Bernstein, Mike Carey, Stefano Ceri, Bruce Croft, ...
This report summarizes the discussion and conclusions of the sixth ad-hoc meeting held May 4-6, 2003 in Lowell, Mass. It observes that information management continues to be a critical component of...
ABSTRACT RAM: Array Processing over a Relational DBMS (2003)
M. L. Kersten, Alex Van Ballegooij, Martin Kersten
CWI is a founding member of ERCIM, the European Research Consortium for Informatics and Mathematics. CWI's research has a theme-oriented structure and is grouped into four clusters. Listed below...
Optimizing main-memory join on modern hardware (2002)
Stefan Manegold, Peter Boncz, Martin Kersten, Ieee Computer Society
AbstractÐIn the past decade, the exponential growth in commodity CPU's speed has far outpaced advances in memory latency. A second trend is that CPU performance advances are not only brought by...
XMark: A benchmark for XML data management (2002)
Albrecht Schmidt, Florian Waas, Martin Kersten, Michael J. Carey, Ioana Manolescu, Ralph Busse
While standardization efforts for XML query languages have been progressing, researchers and users increasingly focus on the database technology that has to deliver on the new challenges that the...
Optimizing main-memory join on modern hardware (2002)
S. Manegold, P. Boncz, M. L. Kersten, Stefan Manegold, Peter Boncz, Martin Kersten
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
Optimizing main-memory join on modern hardware (2002)
S. Manegold, P. Boncz, M. L. Kersten, Stefan Manegold, Peter Boncz, Martin Kersten
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
The XML Benchmark Project (2001)
A. R. Schmidt, F. Waas, M. L. Kersten, D. Florescu, I. Manolescu, M. J. Carey, ...
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
Proteinfraktionierung mittels Membrantrennverfahren / (2000)
München, Techn. Universiẗat, Diss., 2000.
Navigating through a forest of quad trees to spot images in a database (2000)
N. Nes, M. L. Kersten, Peter Bosch, Niels Nes, Martin Kersten
Centrum voor Wiskunde en Informatica Navigating through a forest of quad trees to spot images in a database
A Multi-Query Optimizer for Monet (2000)
S. Manegold, J. Pellenkoft, M. L. Kersten, Stefan Manegold, Arjan Pellenkoft, Martin Kersten
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
A Graph-Oriented Model for Articulation of Ontology Interdependencies (2000)
Prasenjit Mitra, Gio Wiederhold, Martin Kersten
Ontologies explicate the contents, essential properties, and relationships between terms in a knowledge base. Many sources are now accessible with associated ontologies. Most prior work on the use of...
Efficient Relational Storage and Retrieval of XML Documents (2000)
Albrecht Schmidt, Martin Kersten, Menzo Windhouwer, Florian Waas
In this paper, we present a data and an execution model that allow for efficient storage and retrieval of XML documents in a relational database. The data model is strictly based on the notion of...
Navigating through a forest of quad trees to spot images in a database (2000)
N. Nes, M. L. Kersten, Peter Bosch, Niels Nes, Martin Kersten
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
ABSTRACT Optimizing Main-Memory Join On Modern Hardware (1999)
Stefan Manegold, Peter Boncz, Martin Kersten
and their ��� � � ¥ §�§�������§�������������¨������¢��¨������� �...
Indexing Real-world Data Using Semistructured Documents (1999)
A. R. Schmidt, M. A. Windhouwer, M. L. Kersten, Albrecht Schmidt, Menzo Windhouwer, Martin Kersten
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
Acoi: A System for Indexing Multimedia Objects (1999)
Menzo Windhouwer, Albrecht Schmidt, Martin Kersten
In this paper, we present a system that combines independent feature detector programs with multimedia database technology to provide a semantic rich index to multimedia data items on the World Wide...
Albrecht Schmidt, Menzo Windhouwer, Martin Kersten
We propose a grammatical view of the problem of integrating different data items under a database perspective. We introduce a variant of context-free grammars, called feature grammars , whose parsers...
Indexing Real-World Data using Semi-Structured Documents (1999)
Albrecht Schmidt, Menzo Windhouwer, Martin Kersten
We address the problem of deriving meaningful semantic index information for a multimedia database using a semi-structured document model. We show how our framework, called feature grammars, can be...
Indexing Real-world Data Using Semistructured Documents (1999)
Albrecht Schmidt, Albrecht Schmidt, Menzo Windhouwer, Menzo Windhouwer, Martin Kersten, Martin Kersten
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
The Complexity of Transformation-Based Join Enumeration (1997)
Arjan Pellenkoft, Martin Kersten
Query optimizers that explore a search space exhaustively using transformation rules usually apply all possible rules on each alternative, and stop when no new information is produced. A memoizing...
A Framework for Multi-Query Optimization (1997)
Sunil Choenni, Sunil Choenni, Martin Kersten, Martin Kersten
In some key database applications, a sequence of interdependent queries may be posed simultaneously to the DBMS. The optimization of such sequences is called multi-query optimization, and it attempts...
Duplicate-free Generation of Alternatives in Transformation-based Optimizers (1997)
Arjan Pellenkoft, Martin Kersten
Transformation-based optimizers that explore a search space exhaustively usually apply all possible transformation rules on each alternative, and stop when no new information is produced. In general,...
A Cellular Database System for the 21th Century (1997)
. The pervasive penetration of database technology in all areas of IT may suggest that we have reached the end of the database research era. This paper demonstrates that many routes and areas are...
Complexity of Transformation-Based Optimizers and Duplicate-Free Generation of Alternatives (1996)
J. Pellenkoft, M. L. Kersten, Issn -x, Arjan Pellenkoft, ...
Transformation-based optimizers that explore a search space exhaustively usually apply all possible transformation rules on each alternative, and stop when no new information is produced. In general,...
A Perspective on Databases and Data Mining (1995)
Marcel Holsheimer, Martin Kersten, Heikki Mannila, Hannu Toivonen
We discuss the use of database methods for data mining. Recently impressive results have been achieved for some data mining problems using highly specialized and clever data structures. We study how...
The impact of catalogs and join algorithms on probabilistic query optimization (1994)
Arjan Pellenkoft, Martin Kersten
Most of the work on randomized query optimization has relied heavily on the use of transformations rules for the generation of execution plans. Recently, however, we gave evidence that for the...
Fast, randomized joinorder selection---why use transformations (1994)
C. Galindo-legaria, J. Pellenkoft, M. L. Kersten, Arjan Pellenkoft, Martin Kersten
We study the effectiveness of probabilistic selection of join-query evaluation plans without reliance on tree transformation rules. Instead, each candidate plan is chosen uniformly at random from the...
Fast, Randomized Join-Order Selection - Why Use Transformations? (1994)
César Galindo-Legaria, Arjan Pellenkoft, Martin Kersten
We study the effectiveness of probabilistic selection of join-query evaluation plans, without reliance on tree transformation rules. Instead, each candidate plan is chosen uniformly at random from...
Fast, randomized joinorder selection---why use transformations (1994)
Cbsar Galindo-legaria, Arjan Pellenkoft, Martin Kersten
cesarQacm.org arjanQcwi.nl mkOcwi.nl We study the effectiveness of probabilistic se-lection of join-query evaluation plans, t&h-out reliance on tree transformation rules. In-stead, each candidate...
Grundlagen einer Theorie der ferromagnetischen Hysterese und der Koerzitivkraft. (1942)
Stuttgart, Techn. H., Diss., 1942 (Nicht f. d. Austausch).