Parallel Query Execution Mechanisms (cont.)

• Tuning

  • Major problems
    • Control overhead
    • Interference
    • Synchronization delays

• Architecture

  • Discussion of which architecture is best
  • Chose hierarchial

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Solutions:

Ctrl overhead: have the number of ctrl pages linear to number of processes & use primed processes with primed connections (pg. 103)

Sync: try but not force process-process infinity

Chose hierarchial because it combined the better qualities of the other architectures.