A substantial portion of web traffic consists of queries to database web servers. Unfortunately, a common technique to improve web scalability, proxy caching, is ineffective for database web servers because existing web proxy servers cannot cache queries. To address this problem, we modify a recently proposed enhanced proxy server, called an active proxy, to enable Active Query Caching. Our app...

Web crawlers generate significant loads on Web servers, and are difficult to operate. Instead of repeatedly running crawlers at many “client” sites, we propose a central crawler and Web repository that multicasts appropriate subsets of the central repository, and their subsequent changes, to subscribing clients. Loads at Web servers are reduced because a single crawler visits the servers, as op...

Web service infrastrutures usually are comprised of front-end Web servers that accept requests and process them, and backend servers that manage data and services. Current Web servers use various API sets to access backend services. This model does not support service differentiation, overload control, caching of contents generated by backend servers. We have proposed a framework for using serv...

The problem of optimally locating web servers across the Internet is considered. Assuming that the user demand forecast is known, the objective is to minimize cost, subject to satisfying performance requirements of customers (that access the web servers) in terms of throughput and latency thresholds. To solve the optimization problem, three heuristics are considered: greedy heuristic, DEJAVU al...

With the increasing popularity of the World Wide Web, the amount of information available and the use of Web servers are growing exponentially. As a consequence, the number of requests to popular Web servers increases exponentially as well. In order to reduce the overhead induced by frequent requests to the same documents, server caching, also referred to as main memory caching, has been propos...

The Internet has become the leading means for people to get information and interact between organizations. Each year there is an increase of the numbers of Internet users. Organizations must be aware of the performance of their web servers to be able to accommodate this growing demand. Networks, connections, hardware, web servers and operating systems each have a role to play in this market, b...