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14. Query Optimization in DBMS

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The document discusses query optimization by describing how a database system estimates the cost of different query evaluation plans using statistical information about relations. It covers topics like estimating the size of selections, joins, aggregations and other operations to choose the lowest cost plan using transformations and equivalence rules.

Economy & FinanceTechnology
1 of 70
Chapter 14 Query Optimization
Chapter 14: Query Optimization ,[object Object],[object Object],[object Object],[object Object],[object Object]
Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Introduction (Cont.) ,[object Object]
Introduction (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Overview of chapter ,[object Object],[object Object],[object Object],[object Object],[object Object]
Statistical Information for Cost Estimation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Catalog Information about Indices ,[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]
Selection Size Estimation ,[object Object],[object Object],[object Object],[object Object],[object Object]
Statistical Information for Examples ,[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]
Implementation of Complex Selections ,[object Object],[object Object],[object Object],[object Object]
Join Operation: Running Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Estimation of the Size of Joins ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Estimation of the Size of Joins (Cont.) ,[object Object]
Estimation of the Size of Joins (Cont.) ,[object Object],[object Object],[object Object],[object Object]
Size Estimation for Other Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Size Estimation (Cont.) ,[object Object],[object Object],[object Object],[object Object]
Estimation of Number of Distinct Values ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Estimation of Distinct Values (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Estimation of Distinct Values (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Transformation of Relational Expressions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Equivalence Rules ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Pictorial Depiction of Equivalence Rules
Equivalence Rules (Cont.) ,[object Object],[object Object],[object Object]
Equivalence Rules (Cont.) ,[object Object],[object Object],[object Object]
Equivalence Rules (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Equivalence Rules (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Transformation Example ,[object Object],[object Object],[object Object]
Example with Multiple Transformations ,[object Object],[object Object],[object Object],[object Object],[object Object]
Multiple Transformations (Cont.)
Projection Operation Example ,[object Object],[object Object],[object Object], customer-name ((  branch-city = “ Brooklyn” ( branch) account) depositor )
Join Ordering Example ,[object Object],[object Object],[object Object],[object Object],[object Object]
Join Ordering Example (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Enumeration of Equivalent Expressions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Evaluation Plan ,[object Object]
Choice of Evaluation Plans ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cost-Based Optimization ,[object Object],[object Object],[object Object]
Dynamic Programming in Optimization ,[object Object],[object Object],[object Object],[object Object],[object Object]
Join Order Optimization Algorithm ,[object Object]
Left Deep Join Trees ,[object Object]
Cost of Optimization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Interesting Orders in Cost-Based Optimization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Heuristic Optimization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Steps in Typical Heuristic Optimization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Structure of Query Optimizers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Structure of Query Optimizers (Cont.) ,[object Object],[object Object],[object Object],[object Object]
Optimizing Nested Subqueries** ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Optimizing Nested Subqueries (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Optimizing Nested Subqueries (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Optimizing Nested Subqueries (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Materialized Views** ,[object Object],[object Object],[object Object],[object Object]
Materialized View Maintenance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Incremental View Maintenance ,[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]
Selection and Projection Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Aggregation Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Aggregate Operations (Cont.) ,[object Object],[object Object],[object Object]
Other Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Handling Expressions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Query Optimization and Materialized Views ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Materialized View Selection ,[object Object],[object Object],[object Object],[object Object]
End of Chapter (Extra slides with details of selection cost estimation follow)
Selection Cost Estimate Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], branch-name = “Perryridge” ( account)
Selections Using Indices ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cost Estimate Example (Indices) ,[object Object],[object Object],[object Object],[object Object],Consider the query is  branch-name = “Perryridge” ( account) , with the primary index on branch-name.
Selections Involving Comparisons ,[object Object],[object Object],selections of the form  A  V ( r ) or  A  V ( r ) by using a linear file scan or binary search, or by using indices in the following ways:
Example of Cost Estimate for Complex Selection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Connectors in Data Communication DC12
 
Transmission of Digital Data(Data Communication) DC11
Transmission of Digital Data(Data Communication) DC11Transmission of Digital Data(Data Communication) DC11
Transmission of Digital Data(Data Communication) DC11
 
Analog to Digital Encoding in Data Communication DC9
Analog to Digital Encoding in Data Communication DC9Analog to Digital Encoding in Data Communication DC9
Analog to Digital Encoding in Data Communication DC9
 
Signal with DC Component(Data Communication) DC7
Signal with DC Component(Data Communication) DC7Signal with DC Component(Data Communication) DC7
Signal with DC Component(Data Communication) DC7
 
Layer Examples in Data Communication CD4
Layer Examples in Data Communication CD4Layer Examples in Data Communication CD4
Layer Examples in Data Communication CD4
 
OSI Model (Data Communication) DC3
OSI Model (Data Communication) DC3OSI Model (Data Communication) DC3
OSI Model (Data Communication) DC3
 
Basic Concepts in Data Communication DC1
Basic Concepts in Data Communication DC1Basic Concepts in Data Communication DC1
Basic Concepts in Data Communication DC1
 
Token Passing in Data Communication DC25
Token Passing in Data Communication DC25Token Passing in Data Communication DC25
Token Passing in Data Communication DC25
 
Data Link Protocols in Data Communication DC22
Data Link Protocols in Data Communication DC22Data Link Protocols in Data Communication DC22
Data Link Protocols in Data Communication DC22
 
Flow Control in Data Communication DC21
Flow Control in Data Communication DC21Flow Control in Data Communication DC21
Flow Control in Data Communication DC21
 
CRC in Data Communication DC19
CRC in Data Communication DC19CRC in Data Communication DC19
CRC in Data Communication DC19
 
Telephone Networn in Data Communication DC17
Telephone Networn in Data Communication DC17Telephone Networn in Data Communication DC17
Telephone Networn in Data Communication DC17
 
Multiplexing in Data Communication DC15
Multiplexing in Data Communication DC15Multiplexing in Data Communication DC15
Multiplexing in Data Communication DC15
 
Transmission Media in Data Communication DC13
Transmission Media in Data Communication DC13Transmission Media in Data Communication DC13
Transmission Media in Data Communication DC13
 

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14. Query Optimization in DBMS

  • 1. Chapter 14 Query Optimization
  • 2.
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  • 25. Pictorial Depiction of Equivalence Rules
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  • 64. End of Chapter (Extra slides with details of selection cost estimation follow)
  • 65.
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  • 70.