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Why does System R consider only left-deep join trees?
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?
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?
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?
What is a characteristic of left-deep trees that distinguishes them from other types in System R?
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Why are not all left-deep trees in System R fully pipelined?
Why are not all left-deep trees in System R fully pipelined?
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