The Global conceptual Schema in a distributed database contains information about global relations. The condition that all the data of the global relation must be mapped into the fragments, that is, it must not happen that a data item which belongs to a global relation does not belong to any fragment, is called :
A. Disjointness condition
B. Completeness condition
C. Reconstruction condition
D. Aggregation condition
Answer:C
The Global conceptual Schema in a distributed database contains information about global relations. The condition that all the data of the global relation must be mapped into the fragments, that is, it must not happen that a data item which belongs to a global relation does not belong to any fragment, is called :
A. Disjointness condition B. Completeness condition C. Reconstruction condition D. Aggregation condition