Parallel Query Execution Mechanisms (cont.)

• Operator Model

  • Idea: insert parallel operators in an ordered plan
  • Uses the exchange operator
  • Exchange operator
    • Does not manipulate data
    • Provides capabilities for parallel query processing
    • “Changes” a complex query into single process

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“Changes”: can do this by not having any exchange operators in single-processor systems or having 1 or more exchange operators in the qep.