Query Processing and Optimization
Query Processing and Optimization
Query Processing and Optimization
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Sort-Merge Join<br />
• Sort each relation using multiway merge-sort<br />
• Perform merge-join<br />
Scan<br />
unsorted<br />
r<br />
r 1<br />
r 2<br />
•••<br />
sorted<br />
r<br />
Scan<br />
sorted<br />
r<br />
Main Memory<br />
•••<br />
•••<br />
•••<br />
•••<br />
Match<br />
r n<br />
sorted<br />
s<br />
Output<br />
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