Structured Data in Peer-to-Peer Systems
Peer data management; Peer database management; P2P database
A peer database management system is a peer-to-peer (P2P) system that manages structured data. Each node in such a system maintains data which conforms to user- or application-defined structures and can be accessed and retrieved efficiently. Examples of data structures are relations as set of tuples and hierarchical or tree-organized data such as XML data and documents. In contrast to unstructured data (e.g., text and binary objects) structured data can be retrieved by specifying logical conditions and further processed by operations such as set operations, aggregations and joins.
One of the origins of coordinator-free distributed data management were scalable distributed data structures (SDDS). One of these approaches called LH*  is an extension of linear hashing to distributed nodes, and supports key search as well as parallel operations like hash joins and scans.
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