The first edition of this book appeared in 1991 when the technology was new and there were
not too many products. In the Preface to the first edition, we had quoted Michael Stonebraker …

We consider the use of a database cluster for Application Service Provider (ASP). In the ASP
context, applications and databases can be update-intensive and must remain autonomous …

Grid technologies have matured over the last few years. This level of maturity is especially
true in the field of scientific computing in which Grids have become the main infrastructure …

Grid systems provide access to huge storage and computing resources at large scale. While
they have been mainly dedicated to scientific computing for years, grids are now considered …

In distributed systems, replication is used for ensuring availability and increasing
performances. However, the heavy workload of distributed systems such as web2. 0 …

Database clusters provide a cost-effective solutionn for high performance query processing.
By using either inter-or intra-query parallelism on replicated data, they can accelerate …

Relaxing replica freshness has been exploited in database clusters to optimize load
balancing. However, in most approaches, refreshment is typically coupled with other …

ABSTRACT Based on the Online Registration System (ORS) characteristics and key
technology analysis, this paper points out that that a good performance and high stability of …

Les applications Web 2.0 émergentes comme les réseaux sociaux sont confrontées à de
fortes charges. Pour faire face à cette charge, nous envisageons une nouvelle solution qui …

Nowadays, a large number of enterprises operate in a business time schedule of 24× 7.
These enterprises need to deliver information as fast as possible for information support …