Web Reference: This chapter discusses query optimization in distributed database system. In a distributed database system, processing a query comprises of optimization at both the global and the local level. Jul 23, 2025 · In Conclusion, query processing in a distributed database management system (DBMS) is a complex procedure that tackles issues with transaction management, data dissemination, optimization, and fault tolerance. 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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