Databases, Info Systems, and Peer-to-Peer Computing [1st

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Query refers to the names of data items and is independent of the location of the data. The data may be replicated and located anywhere in the data network, the data holders are unknown to the querier and are only intermittently present, and the querier is interested in data itself rather than the location of the data. Therefore, naturally QDN nodes should be named and addressed by their data content rather than an identifier in a virtual name space such as the IP address space. Consequently, with data-centric naming and addressing of the QDN nodes [13], routing [16] and storage [19] in QDN are also based on the content.

Therefore, search optimization is not limited to optimal routing on the available network topology. A QDN can self-organize to a search-efficient topology, which in combination TEAM LinG - Live, Informative, Non-cost and Genuine! 24 F. Banaei-Kashani and C. Shahabi with an intelligent and data-centric query routing/forwarding mechanism can significantly improve the searchability of the QDN. To create a search-efficient topology, interconnection between nodes is correlated with “similarity” of the data content of the nodes: the more similar the data content of two nodes, the more likelihood of interconnection.

Here, we define a taxonomy of approaches to generalize this querying framework for the entire family of QDNs. Fig. 1. Database System Framework for Querying Querical Data Networks (QDNs) TEAM LinG - Live, Informative, Non-cost and Genuine! , centralized and decentralized), we recognize two approaches to implement a DBS-based querying system for QDNs: 1. Database for QDN (Figure 1a): This approach corresponds to the querying systems with centralized query processing. These systems are similar to other centralized database applications, where data are collected from some data sources (depending on the host application, the data sources can be text documents, media files, and in this case, QDN data) to be separately and centrally processed.

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