Research on query optimization model of distributed database
Xinli Zhang · Electronic Design Engineering · 2013
Distributed database system,because the data with the distribution and redundancy,makes the network transmission cost data is very high, the difficulty and complexity of query processing. In view of the traditional optimization criteria is relatively unitary, lack of flexibility, processing scheme ignores the common query used, this paper establishes a new query processing model.The model is a new optimization criteria for the selection of function, the user can choose the optimization criteria set in advance according to the actual needs of the. The utilization rate of the query result records to improve the use of commonly used statements at the rate of data query method table, May reduce the transmission of mass data query.