A P2P Object-Oriented Database System that Supports Multi-Attribute and Range Queries with Improved Query Response Time

摘要

Nowadays, the demand for the processing and storing of data has been growing exponentially rapid. The massive demand of these data has limited the traditional way of storing and processing data based on client/server architecture. To overcome this bottleneck, a peer-to-peer object-oriented database is proposed because of its robustness, fault-tolerance, scalability and less administrative nature. Chord is a structured P2P overlay network providing indexing facility enables users to locate a piece of data based on a given key through an efficient routing algorithm. The proposed object-oriented database is built on the openChord, a Chord implementation. In this paper, we present a preliminary design for a P2P object-oriented database on the openChord which supports multi-attribute and range queries. The storing and processing of objects are managed locally to reduce the network traffic. Pointers of objects are stored around the routing path of nodes to efficiently access to a desired object to reduce storage cost and to preserve the object-oriented features. Nodes holding the object pointers are distributed around the network to reduce the lookup time. Nodes are organized into logical class hubs where each hub handles pointers to nodes storing objects belonging to a particular class. Queries involving multi-attributes and ranges are routed to the related class hubs to retrieve the desired objects. Our proposed system will be tested using an Order Picking application for a warehouse with only dozens of nodes connected in a wireless local area network. Tests were carried out with another P2P database system measured on reliability and performance of both P2P database systems.