System R Decision Making and Left-Deep Join Trees Quiz
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Questions and Answers

Why does System R consider only left-deep join trees?

  • To reduce the number of alternative plans (correct)
  • To write intermediate results to temporary files
  • To ensure all join trees are fully pipelined
  • To make the search space less restricted
  • What distinguishes left-deep trees in System R regarding intermediate results?

  • They write all intermediate results to temporary files for later use
  • They generate fully pipelined plans without writing intermediate results to files (correct)
  • They generate plans with limited joins
  • They avoid generating fully pipelined plans
  • How do left-deep join trees help in managing the search space in System R?

  • By generating all possible join trees
  • By increasing the number of alternative plans
  • By ensuring all plans are written to temporary files
  • By restricting the number of alternative plans (correct)
  • What is a characteristic of left-deep trees that distinguishes them from other types in System R?

    <p>Ability to generate fully pipelined plans</p> Signup and view all the answers

    Why are not all left-deep trees in System R fully pipelined?

    <p>Due to cases like SM join</p> Signup and view all the answers

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