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Schema architectures and their relationship to transaction processing in distributed database systems

Peter Apers, Peter Scheuermann
1991 Information Sciences  
The conceptual and external schema descriptions may use different data models (e.g. relational, network, or semantic data models).  ...  In addition to the three schemas represented by boxes in Figure 1 , the ANSI,/SPARC architecture also contains a number of mappings, represented by edges in the diagram.  ...  used in [12] in order similarly to reduce the cost of processing queries in multidatabase systems using aggregate functions for overlapping data values.  ... 
doi:10.1016/0020-0255(91)90044-u fatcat:cm5ht3htazhjlcdxwhhllwbtny