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Query evaluation plan - PowerPoint PPT Presentation

Query Processing

Query Processing

Query Processing. Overview Measures of Query Cost Selection Operation Sorting Join Operation Other Operations Evaluation of Expressions. Basic Steps in Query Processing. 1. Parsing and translation 2. Optimization* 3. Evaluation. Parsing, Translation and Evaluation.

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700 views • 69 slides
Query Optimization

Query Optimization

Query Optimization. Chapter 15. Query Evaluation. Query. Query Parser. Parsed query. Query Optmizer. Plan Generator. Plan Cost Estimator. Catalog Manager. Evaluation Plan. Query Plan Evaluator. Query Optimization. It is responsible for identifying an efficient execution plan.

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418 views • 40 slides
Chapter 13: Query Processing

Chapter 13: Query Processing

Chapter 13: Query Processing. Query Processing. What is Query Processing Measures of Query Cost Selection Operation Sorting Join Operation. What is Query Processing?. Query processing: Activities involved in extracting data from a database.

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309 views • 25 slides
Query Processing

Query Processing

Query Processing. A query is stated using SQL or other languages, ideally natural languages After query parsing, each query is essentially treated as a relational algebra expression Query optimizer Enumerates the possible plans to evaluate expression,

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472 views • 24 slides
Chapter 10 Query Optimization

Chapter 10 Query Optimization

Chapter 10 Query Optimization. 10.1 Overview 10.2 Estimating Statistics of Expression 10.3 Transformation of Relational Expressions 10.4 Choice of Evaluation Plans. 10.1 Overview.

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221 views • 21 slides

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