query decomposition

query decomposition

Separating elements of a query so that each can be processed by a different database server.
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Query Allows the query decomposition of a Decomposer query made by the user over the federation into specific queries to each one of the sources.
Finally, by choosing an automatic or semi-automatic schema integration strategy (for example SIM (2) [5,6]), and defining, based on it, permission integration and query decomposition strategies, Integrator, Query Decomposer and Query Filter are automated.
An example of global query, query decomposition and result format for the case study is shown in Figure 14.
0's Intelligent Query Decomposition technology automatically creates the multiple SQL SELECT statements needed to access each underlying RDBMS, and offloads all possible processing (including joins and aggregation) to the remote RDBMS servers for efficiency.