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Efficient Approximate Query Processing in Peer-to-Peer Networks
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Efficient Approximate Query Processing in Peer-to-Peer Networks

Abstract”Peer-to-peer (P2P) databases are becoming prevalent on the Internet for distribution and sharing of documents, applications, and other digital media. The problem of answering large-scale ad hoc analysis queries, for example, aggregation queries, on these databases poses unique challenges. Exact solutions can be time consuming and difficult to implement, given the distributed and dynamic nature of P2P databases. In this paper, we present novel sampling-based techniques for approximate answering of ad hoc aggregation queries in such databases. Computing a high-quality random sample of the database efficiently in the P2P environment is complicated due to several factors: the data is distributed (usually in uneven quantities) across many peers, within each peer, the data is often highly correlated, and, moreover, even collecting a random sample of the peers is difficult to accomplish. To counter these problems, we have developed an adaptive two-phase sampling approach based on random walks of the P2P graph, as well as block-level sampling techniques. We present extensive experimental evaluations to demonstrate the feasibility of our proposed solution.

Software Requirement Specification
The software requirement specification is produced at the culmination of the analysis task. The function and performance allocated to software as part of system engineering are refined by establishing a complete information description as functional representation, a representation of system behavior, an indication of performance requirements and design constraints, appropriate validation criteria.
User Interface
* Swing - Swing is a set of classes that provides more powerful and flexible components that are possible with AWT. In addition to the familiar components, such as button checkboxes and labels, swing supplies several exciting additions, including tabbed panes, scroll panes, trees and tables.
* Applet - Applet is a dynamic and interactive program that can run inside a web page displayed by a java capable browser such as hot java or Netscape.

Hardware Interface

Hard disk : 40 GB
RAM : 512 MB
Processor Speed : 3.00GHz
Processor : Pentium IV Processor

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