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	STUDIA INFORMATICA - Issue no. 1 / 2014

	Article:	DATA TRANSFER OPTIMIZATION IN DISTRIBUTED DATABASE QUERY PROCESSING. Authors: VIORICA VARGA.


	Abstract: Query execution in a distributed database requires data transfers between the processing nodes of the system. An important step in the query optimization is the minimization of the data transfers which often incur larger latencies than local data processing. In this paper we propose a new method and algorithms for determining the processing nodes for the evaluation of each relational operator of a query so that data transfer is minimal. We model our method as a data transfer minimal cost problem. 2010 Mathematics Subject Classification. 68P15. 1998 CR Categories and Descriptors. H.2.4 [Database Management]: Systems - Distributed Databases. Key words and phrases. distributed databases, query optimization, data transfer cost.




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