DBMS are a ubiquitous building block of the software stack in many complex applications. Middleware technologies, application servers and mapping approaches hide the core database technologies just like power, networking infrastructure and operating ...

There is currently a lot of interest in resource virtualization as an important technique for addressing the problems of manageability, reliability, and security in computer systems. Resource virtualization decouples the user's perception of hardware ...

Today, a majority of data is fundamentally distributed in nature. Data for almost any task is collected over a broad area, and streams in at a much greater rate than ever before. In particular, advances in sensor technology and miniaturization have led ...

In the demonstration, we will present the concepts and an implementation of an inductive database -- as proposed by Imielinski and Mannila -- in the relational model. The goal is to support all steps of the knowledge discovery process, from pre-...

In this demonstration we show the Bibliographic Exploration tool BIBEX. BIBEX is based on the graph database query engine DEX and integrates both the Citeseer and DBLP databases. BIBEX can be found in our web site at www.dama.upc.edu/bibex.

BIBEX allows ...

Scientific data are available through an increasing number of heterogeneous, independently evolving, sources. Although the sources themselves are independently evolving, the data stored in them are not. There exist inherent and intricate relationships ...

Major media companies such as The Financial Times, the Wall Street Journal or Reuters generate huge amounts of textual news data on a daily basis. Mining frequent patterns in this mass of information is critical for knowledge workers such as financial ...

Several Web sites deliver a large number of pages, each publishing data about one instance of some real world entity, such as an athlete, a stock quote, a book. Even though it is easy for a human reader to recognize these instances, current search ...

In this demonstration, we present the design and features of iDataGuard. iDataGuard is an interoperable security middleware that allows users to outsource their file systems to heterogeneous data storage providers available on the Internet. Examples of ...

With the Web 2.0 trend and its participation of end-users more and more data and information services are online accessible, such as web sites, Wikis, or web services. The integration of this plethora of information is taken over by the community: so-...

The capability to easily find useful services (software applications, software components, scientific computations) becomes increasingly critical in several fields. Current approaches for services retrieval are mostly limited to the matching of their ...

End-user programmers---the 45 million of them, as estimated for 2001 in US alone [7]---routinely use spreadsheet to visualize, manipulate, and analyze data. Thanks to this environment, they can build applications that solve their daily problems. Even ...

By comparing genomes among both closely and distally related species, comparative genomics analysis characterizes structures and functions of different genomes in both conserved and divergent regions. Synteny blocks, which are conserved blocks of genes ...

In this short paper we describe the data that Yahoo! handles, the current trends in Web applications, and the many challenges that this poses for Yahoo! Research. These challenges have led to the development of new data systems and novel data mining ...

Modern enterprise data warehouses have complex workloads that are notoriously difficult to manage. An important problem in workload management is to run these complex workloads 'optimally'. Traditionally this problem has been studied in the OLTP (Online ...

The mobile phone industry has reached a saturation point. With low growth rates and fewer new customers available to acquire, competition among mobile operators is now focused on attracting competitors' customers. This leads to a significant downward ...

Estimating the number of distinct elements in a large multiset has several applications, and hence has attracted active research in the past two decades. Several sampling and sketching algorithms have been proposed to accurately solve this problem. The ...

We introduce a novel spatial join operator, the ring-constrained join (RCJ). Given two sets P and Q of spatial points, the result of RCJ consists of pairs (p, q) (where p ε P, q ε Q) satisfying an intuitive geometric constraint: the smallest circle ...

This paper studies the problem of evaluating continuous multi-way joins on top of Distributed Hash Tables (DHTs). We present a novel algorithm, called recursive join (RJoin), that takes into account various parameters crucial in a distributed setting ...

Users often do not require a complete answer to their query but rather only a sample. They expect the sample to be either the largest possible or the most representative (or both) given the resources available. We call the query processing techniques ...