Database Change Notifications: Primitives for Efficient Database Query Result Caching (2008)
Cesar Galindo-legaria, Torsten Grabs, Christian Kleinerman, Florian Waas
Many database applications implement caching of data from a back-end database server to avoid repeated round trips to the back-end and to improve response times for end-user requests. For example,...
Abstract Why And How To Benchmark XML Databases (2008)
Michael J. Carey, Florian Waas
Benchmarks belong to the very standard repertory of tools deployed in database development. Assessing the capabilities of a system, analyzing actual and potential bottlenecks, and, naturally,...
In Quest of the Bottleneck --- Monitoring Parallel Database Systems (2007)
Stefan Manegold Florian, Florian Waas, Daniel Gudlat
. Monitoring query processing has proven to be an effective technique to detect bottlenecks in sequential query execution systems' components. Monitoring distributed execution in parallel...
S. Manegold, F. Waas, M. L. Kersten, Stefan Manegold, Florian Waas, Martin L. Kersten
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
The Eect of Cost Distributions on Evolutionary Optimization Algorithms (2007)
F. Waas, C. Galindo-legaria, Florian Waas
The effect of cost distributions on evolutionary optimization
Milind M. Joshi, Florian Waas, Ming-chuan Wu
The quality of execution plans generated by a query optimizer is tied to the accuracy of its cardinality estimation. Errors in estimation lead to poor performance, erratic behavior, and user...
Milind M. Joshi, Florian Waas, Ming-chuan Wu
The quality of execution plans generated by a query optimizer is tied to the accuracy of its cardinality estimation. Errors in estimation lead to poor performance, erratic behavior, and user...
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...
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
FeedbackBypass: A New Approach to Interactive Similarity Query Processing (2001)
Ilaria Bartolini, Paolo Ciaccia, Florian Waas
In recent years, several methods have been proposed for implementing interactive similarity queries on multimedia databases. Common to all these methods is the idea to exploit user feedback in order...
FeedbackBypass: A New Approach to Interactive Similarity Query Processing (2001)
Ilaria Bartolini, Paolo Ciaccia, Florian Waas
In recent years, several methods have been proposed for implementing interactive similarity queries on multimedia databases. Common to all these methods is the idea to exploit user feedback in order...
FeedbackBypass: A New Approach to Interactive Similarity Query Processing (2001)
Ilaria Bartolini, Paolo Ciaccia, Florian Waas
In recent years, several methods have been proposed for implementing interactive similarity queries on multimedia databases. Common to all these methods is the idea to exploit user feedback in order...
FeedbackBypass: A New Approach to Interactive Similarity Query Processing (2001)
Ilaria Bartolini, Paolo Ciaccia, Florian Waas
In recent years, several methods have been proposed for implementing interactive similarity queries on multimedia databases. Common to all these methods is the idea to exploit user feedback in order...
Counting, enumerating, and sampling of execution plans in a cost-based query optimizer (2000)
F. Waas, Florian Waas, Cesar Galindo-legaria
Centrum voor Wiskunde en Informatica Counting, enumerating and sampling of execution plans in a cost-based query optimizer
Memory aware query scheduling in a database cluster (2000)
F. Waas, M. L. Kersten, Florian Waas, Martin L. Kersten
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
Using the wavelet transform to learn from user feedback (2000)
Ilaria Bartolini, Paolo Ciaccia, Florian Waas
User feedback has proven very successful to query large multimedia databases. Due to the nature of the data representation and the mismatch between mathematical models and human perception, the query...
Using the wavelet transform to learn from user feedback (2000)
Ilaria Bartolini, Paolo Ciaccia, Florian Waas
User feedback has proven very successful to query large multimedia databases. Due to the nature of the data representation and the mismatch between mathematical models and human perception, the query...
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...
Counting, enumerating, and sampling of execution plans in a cost-based query optimizer (2000)
F. Waas, Florian Waas, César Galindo-legaria
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
Probabilistic bottom-up join order selection — breaking the curse of NP-completeness (1999)
F. Waas, J. Pellenkoft, Florian Waas, Arjan Pellenkoft
for promotion of mathematics and computer science and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
Curse of NP-completeness ABSTRACT (1999)
F. Waas, J. Pellenkoft, Florian Waas, Arjan Pellenkoft
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
Efficient Enumeration of Non-isomorphic Processing Trees (1998)
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
Exploiting Cost Distributions for Query Optimization (1998)
F. Waas, J. Pellenkoft, Florian Waas, Arjan Pellenkoft
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
ABSTRACT On Optimal Pipeline Processing in Parallel Query Execution (1998)
S. Manegold, F. Waas, M. L. Kersten, Copyright Stichting, Mathematisch Centrum, Stefan Manegold, ...
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
Exploiting Cost Distributions for Query Optimization (1998)
F. Waas, A. Pellenkoft, Florian Waas, Arjan Pellenkoft
and their applications. SMC is sponsored by the Netherlands Organization for Scientific Research (NWO). CWI is a member of
Load Balanced Query Evaluation in Shared-Everything Environments (1997)
Stefan Manegold, Johann K. Obermaier, Florian Waas, Johann-Christoph Freytag
In this paper, we present data threaded execution, a new strategy to exploit pipelining and intra-operator parallelism in a shared-everything environment. Data threaded execution is resistent against...
Load Balanced Query Evaluation in SharedEverything Environments (1997)
Stefan Manegold, Johann K. Obermaier, Florian Waas
In this paper, we present data threaded execution, a new strategy to exploit pipelining and intraoperator parallelism in a shared-everything environment. Data threaded execution is very intuitive,...
Data Threaded Query Evaluation in Shared-Everything Environments (1996)
Stefan Manegold, Johann K. Obermaier, Florian Waas, Johann-christoph Freytag
In this paper, we present data threaded execution, a new strategy to exploit pipelining and intra-operator parallelism in a shared-everything environment. Data threaded execution does neither suffer...
Dynamic Aspects of Query Processing in Parallel Database Systems (1996)
Johann K. Obermaier, Florian Waas
This paper reports ongoing work in developing a query representation method for the implementation of dynamic and parallel query processing in database systems. We present Stream Processing based...
Load Balanced Query Evaluation in Shared-Everything Environments (1996)
Stefan Manegold Johann, Johann K. Obermaier, Florian Waas
. In this paper, we present data threaded execution, a new strategy to exploit both, pipelining and intra-operator parallelism in shared-everything environments. Data threaded execution is intuitive,...
Dynamic Aspects of Query Processing in Parallel Database Systems (1996)
Johann K. Obermaier, Florian Waas
This paper reports ongoing work in developing a query representation method for the implementation of dynamic and parallel query processing in database systems. We present Stream Processing based...