Decoupled Query Optimization for Federated Database Systems

  title={Decoupled Query Optimization for Federated Database Systems},
  author={Amol Deshpande and Joseph M. Hellerstein},
We study the problem of query optimization in federated database systems. The nature of federated databases explicitly decouples many aspects of the optimization process, often making it imperative for the optimizer to consult underlying data sources while doing cost-based optimization. This not only increases the cost of optimization, but also changes the trade-offs involved in the optimization process significantly. The dominant cost in the decoupled optimization process is the “cost of… CONTINUE READING
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