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ch13

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The document discusses various algorithms for query processing operations like selection, sorting, and join. It provides cost estimates for each algorithm based on factors like the number of block transfers and seeks. The most efficient algorithms depend on characteristics of the relations and whether indices are available. Nested loop and block nested loop joins have high costs, while merge join and hash join may have lower costs depending on the situation.

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Chapter 13: Query Processing Database System Concepts, 5th Ed . ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use Aug 10, 2006
Chapter 13: Query Processing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.2 Database System Concepts - 5 th Edition.
Basic Steps in Query Processing 1. Parsing and translation 2. Optimization 3. Evaluation 13.3 Database System Concepts - 5 th Edition.
Basic Steps in Query Processing (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],13.4 Database System Concepts - 5 th Edition.
Basic Steps in Query Processing : Optimization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.5 Database System Concepts - 5 th Edition.
Basic Steps: Optimization (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.6 Database System Concepts - 5 th Edition.
Measures of Query Cost ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.7 Database System Concepts - 5 th Edition.
Measures of Query Cost (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.8 Database System Concepts - 5 th Edition.
Selection Operation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.9 Database System Concepts - 5 th Edition.
Selection Operation (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.10 Database System Concepts - 5 th Edition.
Selections Using Indices ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.11 Database System Concepts - 5 th Edition.
Selections Involving Comparisons ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.12 Database System Concepts - 5 th Edition.
Implementation of Complex Selections ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.13 Database System Concepts - 5 th Edition.
Algorithms for Complex Selections ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.14 Database System Concepts - 5 th Edition.
Sorting ,[object Object],[object Object],13.15 Database System Concepts - 5 th Edition.
External Sort-Merge ,[object Object],[object Object],13.16 Database System Concepts - 5 th Edition. Let M denote memory size (in pages).
External Sort-Merge (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.17 Database System Concepts - 5 th Edition.
External Sort-Merge (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],13.18 Database System Concepts - 5 th Edition.
Example: External Sorting Using Sort-Merge 13.19 Database System Concepts - 5 th Edition.
External Merge Sort (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.20 Database System Concepts - 5 th Edition.
External Merge Sort (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.21 Database System Concepts - 5 th Edition.
Join Operation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.22 Database System Concepts - 5 th Edition.
Nested-Loop Join ,[object Object],[object Object],[object Object],[object Object],13.23 Database System Concepts - 5 th Edition.
Nested-Loop Join (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.24 Database System Concepts - 5 th Edition.
Block Nested-Loop Join ,[object Object],[object Object],13.25 Database System Concepts - 5 th Edition.
Block Nested-Loop Join (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.26 Database System Concepts - 5 th Edition.
Indexed Nested-Loop Join ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.27 Database System Concepts - 5 th Edition.
Example of Nested-Loop Join Costs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.28 Database System Concepts - 5 th Edition.
Merge-Join ,[object Object],[object Object],[object Object],[object Object],[object Object],13.29 Database System Concepts - 5 th Edition.
Merge-Join (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.30 Database System Concepts - 5 th Edition.
Hash-Join ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.31 Database System Concepts - 5 th Edition.
Hash-Join (Cont.) 13.32 Database System Concepts - 5 th Edition.
Hash-Join (Cont.) ,[object Object],[object Object],[object Object],13.33 Database System Concepts - 5 th Edition.
Hash-Join Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],13.34 Database System Concepts - 5 th Edition. The hash-join of r and s is computed as follows.
Hash Join (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.35 Database System Concepts - 5 th Edition. Relation s is called the build input and r is called the probe input. Hash Join Algorithm (cont)
Hash-Join algorithm (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.36 Database System Concepts - 5 th Edition.
Handling of Overflows ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.37 Database System Concepts - 5 th Edition.
Cost of Hash-Join ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.38 Database System Concepts - 5 th Edition.
Example of Cost of Hash-Join ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.39 Database System Concepts - 5 th Edition. customer depositor
Hybrid Hash–Join ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.40 Database System Concepts - 5 th Edition.
Complex Joins ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.41 Database System Concepts - 5 th Edition.
Other Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.42 Database System Concepts - 5 th Edition.
Other Operations : Aggregation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.43 Database System Concepts - 5 th Edition.
Other Operations : Set Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.44 Database System Concepts - 5 th Edition.
Other Operations : Outer Join ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.45 Database System Concepts - 5 th Edition.
Evaluation of Expressions ,[object Object],[object Object],[object Object],[object Object],[object Object],13.46 Database System Concepts - 5 th Edition.
Materialization ,[object Object],[object Object],13.47 Database System Concepts - 5 th Edition.
Materialization (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.48 Database System Concepts - 5 th Edition.
Pipelining ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.49 Database System Concepts - 5 th Edition.
Pipelining (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.50 Database System Concepts - 5 th Edition.
Pipelining (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.51 Database System Concepts - 5 th Edition.
Evaluation Algorithms for Pipelining ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.52 Database System Concepts - 5 th Edition.
End of Chapter Database System Concepts, 5th Ed . ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use
Figure 13.2 13.54 Database System Concepts - 5 th Edition.
Complex Joins ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],13.55 Database System Concepts - 5 th Edition.

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ch13

  • 1. Chapter 13: Query Processing Database System Concepts, 5th Ed . ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use Aug 10, 2006
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  • 3. Basic Steps in Query Processing 1. Parsing and translation 2. Optimization 3. Evaluation 13.3 Database System Concepts - 5 th Edition.
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  • 19. Example: External Sorting Using Sort-Merge 13.19 Database System Concepts - 5 th Edition.
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  • 32. Hash-Join (Cont.) 13.32 Database System Concepts - 5 th Edition.
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  • 53. End of Chapter Database System Concepts, 5th Ed . ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use
  • 54. Figure 13.2 13.54 Database System Concepts - 5 th Edition.
  • 55.
  翻译：