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Expressive Query Translation in Peer Database Networks. A Query Processing Mechanism in Peer to Peer Data Sharing Systems

Автор:   Md M.M.
мягкая обложка
88 страниц
2009 год
Издательство:   Книга по Требованию
Цена:
1994 руб
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Описание:In a such a network, each peer chooses its own data model and schema, and maintains data independently without any global coordinator. This book presents a query translation mechanism between heterogeneous peers in Peer to Peer Database Networks. A Peer to Peer Database Network combines a database management system with P2P functionality. One of the problems in such a system is translating queries between peers taking into account both the schema and data heterogeneity. The translation mechanism is evaluated on a prototype peer-to-peer network to demonstrate the viability of the approach. Based on the mapping information, our algorithm applies translation rules to translate queries. Query translation is the problem of rewriting a query posed in terms of one peer schema to a query in terms of another peer schema. The proposed approach uses of user-provided syntax and data level mappings that each peer constructs and shares with other peers.


Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка

2990 руб
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Linux Network Administrator Guide, Second Edition

Fortunately, Linux provides an answer to this dilemma. This answer involves a component of a group of advanced networking features called Network Address Translation (NAT). NAT describes the process of modifying the network addresses contained with datagram headers while they are in transit. This might sound odd at first, but we'll show that it is ideal for solving the problem we've just described and many have encountered. IP masquerade is the name given to one type of network address translation that allows all of the hosts on a private network to use the Internet at the price of a single IP address. IP masquerading allows you to use a private (reserved) IP network address on your LAN and have your Linux-based router perform some clever, real-time translation of IP addresses and ports. When it receives a datagram from a computer on the LAN, it takes note of the type of datagram it is, "TCP," "UDP," "ICMP," etc., and modifies the datagram so that it looks like it was generated by the router machine itself (and remembers that it has done so) ...»

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