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Explain how the Cost Estimation and Heuristic Rules can be used to optimize query processing speed? A distributed database system is a collection of logically

  1. Explain how the Cost Estimation and Heuristic Rules can be used to optimize query processing speed? 
  2. A distributed database system is a collection of logically related databases that co-operate in a transparent manner. Discuss the benefits of a distributed database over a centralized database.

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