Discussion
A heterogeneous distributed database is which of the following?
Answer: D
Correct answer: A different DBMS is used at each location and data are distributed across all nodes.
Heterogeneous means the sites run different products, and the difficulty is exactly that: differing SQL dialects, data types, transaction models and catalogue structures must be reconciled before a single query can span them. Homogeneity is easier to manage but is often not available, since sites arrive through acquisition and separate history.
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