Abstract Methods for Approximate Query Processing (AQP) are essential for dealing with
massive data. They are often the only means of providing interactive response times when …

In online aggregation, a database system processes a user's aggregation query in an online
fashion. At all times during processing, the system gives the user an estimate of the final …

With the increasing amount of text data stored in relational databases, there is a demand for
RDBMS to support keyword queries over text data. As a search result is often assembled …

Exploratory data visualization calls for iterative analyses, but very large databases are often
far too slow to allow interactive exploration. Incremental, approximate database queries …

An integral part of many data-intensive applications is the need to collect and analyze
enormous datasets efficiently. Concurrent with such application needs is the increasing …

Au cours de ces dernières années, un nouvel environnement s' est développé dans lequel
les données doivent être collectées et traitées instantanément dès leur arrivée. La gestion …

Global information systems provide its users with a centralized and transparent view of many
heterogeneous and distributed sources of data. The requests to access data at a central site …

The main objective of this chapter is to present a general overview of existing approaches
on query processing and the authors' vision on query evaluation in pervasive environments …

In last ten years, we have witnessed the success of P2P (Peer-to-Peer) network. It facilitates
the information sharing to an unprecedented scale. Some popular applications, such as …