Web Reference: Jul 23, 2025 · Query processing in a distributed database management system requires the transmission of data between the computers in a network. A distribution strategy for a query is the ordering of data transmissions and local data processing in a database system. The document discusses query processing in distributed database systems, outlining the definition of queries, the role and functions of query processors, and key challenges such as query optimization. First we discuss the steps involved in query processing and then elaborate on the communication costs of processing a distributed query. Finally we discuss a special operation, called a semijoin, which is used to optimize some types of queries in a DDBMS.
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