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日期:2024-08-29
Cost metric: # of I/Os. We will ignore output costs. ... Page-oriented Nested Loops
join: For each page of R, get each page of S, and write out matching pairs of ......
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日期:2024-09-04
Simple Nested Loops Join. For each tuple in the outer relation R, we scan the
entire inner relation S. Cost: M + (pR * M) * N = 1000 + 100*1000*500 I/Os: 140 ......
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日期:2024-09-03
Cost metric: # of I/Os. We will ignore output costs. SELECT *. FROM. Reserves ...
Page-oriented Nested Loops join: For each page of R, get each page of S, and ......
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日期:2024-09-04
Nested-Loop Joins. Example. Relations not clustered. T(R1) = 10,000 T(R2) =
5,000. R1 as the outer relation. Cost for each R1 tuple t1: read tuple t1 + read ......
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日期:2024-08-29
Apply selection on all pairs of tuples. Family of “nested-loops” joins. Introduction
to Database Systems. 4. Tuple Nested Loops Join. Cost: M + pR * M * N = 1000 ......
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日期:2024-08-28
Block-Nested Loop Join (BNLJ) .... We will ignore output costs (as always) as the
results are ... A) Tuple-at-a-time Nested Loops join: Scan outer relation R,....
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日期:2024-09-01
For each plan operator and each algorithm we have a cost formula ... Block
Nested-Loop Join (Cont.) Cost: Worst case estimate: br bs + br block accesses....
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日期:2024-09-01
Roadmap. • A simple operator: Nested Loop Join. • Preliminaries. – Cost model.
– Clustering. – Operator classes. • Operator implementation (with examples from
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