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13. Query Processing in DBMS

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Chapter 13: Query Processing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Basic Steps in Query Processing ,[object Object],[object Object],[object Object]
Basic Steps in Query Processing (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Basic Steps in Query Processing : Optimization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Basic Steps: Optimization (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Measures of Query Cost ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Measures of Query Cost (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Selection Operation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Selection Operation (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
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]
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]
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]
Algorithms for Complex Selections ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Sorting ,[object Object],[object Object]
External Sort-Merge ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Let M denote memory size (in pages).
External Sort-Merge (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Example: External Sorting Using Sort-Merge
External Merge Sort (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Join Operation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Nested-Loop Join ,[object Object],[object Object],[object Object],[object Object]
Nested-Loop Join (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Block Nested-Loop Join ,[object Object],[object Object]
Block Nested-Loop Join (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Indexed Nested-Loop Join ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example of Nested-Loop Join Costs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Merge-Join ,[object Object],[object Object],[object Object],[object Object],[object Object]
Merge-Join (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Hash-Join ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Hash-Join (Cont.)
Hash-Join (Cont.) ,[object Object],[object Object],[object Object]
Hash-Join Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],The hash-join of r and s is computed as follows. Relation s is called the build input and r is called the probe input.
Hash-Join algorithm (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
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]
Cost of Hash-Join ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example of Cost of Hash-Join ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],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]
Complex Joins ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Other Operations ,[object Object],[object Object],[object Object],[object Object]
Other Operations : Aggregation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Other Operations : Set Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Other Operations : Outer Join ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Evaluation of Expressions ,[object Object],[object Object],[object Object],[object Object],[object Object]
Materialization ,[object Object],[object Object]
Materialization (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Pipelining ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Pipelining (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]
Pipelining (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Evaluation Algorithms for Pipelining ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Complex Joins ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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