Now showing items 1-9 of 9
Evaluating different approaches for indexing fuzzy sets
Providing efficient query processing in database systems is one step towards gaining acceptance of such systems by end users. We propose several techniques for indexing fuzzy sets in databases to improve the query evaluation ...
Strategies for Query Unnesting in XML databases
(Association for Computing Machinery (ACM), 2006)
Algebraic Translation and Optimization of (Nested) XPath Expressions
The XPath language incorporates powerful primitives for formulating queries containing nested subexpressions which are existentially or universally quantified. However, even the best published approaches for evaluating ...
Anatomy of a native XML base management system
(Springer Verlag (Germany), 2002)
Several alternatives to manage large XML document collections exist, ranging from file systems over relational or other database systems to specifically tailored XML base management systems. In this paper we give a tour ...
The implementation and performance of compressed databases
(Association for Computing Machinery; 1999, 2000)
In this paper, we show how compression can be integrated into a relational database system. Specifically, we describe how the storage manager, the query execution engine, and the query optimizer of a database system can ...
XML-Datenbanken und ihre Anwendung
Due to its fast proliferation,the amount of XML data is steadily increasing and XML-based applications become more and more complex. This requires effective and efficient methods to manage large amounts of persistent XML. ...
Engineering a new abstraction layer to optimize the HEP analysis process
(Institute of Electrical and Electronics Engineers (IEEE), 2004)
Presently, in the new high-energy physics experiments we are observing a growing complexity in the interfaces of the analysis tools. As a consequence, end users have to master programming, understand complex frameworks and ...
A performance study of four index structures for set-valued attributes of low cardinality
(Springer Verlag (Germany), 2003)
The efficient retrieval of data items on set-valued attributes is an important research topic that has attracted little attention so far. We studied and modified four index structures (sequential signature files, signature ...
Evaluating lock-based protocols for cooperation on XML documents
(Association for Computing Machinery; 1999, 2004)
We discuss four different core protocols for synchronizing access to and modifications of XML document collections. These core protocols synchronize structure traversals and modifications. They are meant to be integrated ...