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Oracle Sql Tuning

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Chris Adkin
Chris Adkin

Presentation On Trouble Shooting Poor Execution Plans

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An Introduction To Oracle SQL Tuning Chris Adkin 30 th May 2008
Some Inspirational Thoughts Before We Begin . . . ,[object Object],[object Object],[object Object],[object Object],[object Object]
Some Inspirational Thoughts Before We Begin . . . ,[object Object]
Some Inspirational Thoughts Before We Begin . . . ,[object Object]
Some Inspirational Thoughts Before We Begin . . . ,[object Object]
Some Inspirational Thoughts Before We Begin . . . ,[object Object]
Section 1 Mechanics Of The Cost Based Optimizer
What Is The Optimizer ,[object Object],[object Object],[object Object],[object Object],[object Object]
Stages Of Optimisation ,[object Object],[object Object],[object Object],[object Object]
Stages Of Optimisation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Stages Of Optimisation ,[object Object],[object Object],[object Object],[object Object]
What Influences The Cost Based Optimizer ? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What Influences The Cost Based Optimizer ? ,[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],[object Object]
What Influences The Cost Based Optimizer ? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What Influences The Cost Based Optimizer ? ,[object Object],[object Object],[object Object],[object Object],[object Object]
What Influences The Cost Based Optimizer ,[object Object],[object Object],[object Object],[object Object]
What Influences The Cost Based Optimizer ,[object Object],[object Object],[object Object],[object Object],[object Object]
Section 2 A Plan Of Attack For Investigating A Bad Plan
Identify The SQL To Be Tuned ,[object Object],[object Object],[object Object],[object Object],[object Object]
A Simple Script For Identifyng SQL To Be Tuned ,[object Object],[object Object],[object Object]
Causes Of Poor Performance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Causes Of Poor Performance ,[object Object],[object Object],[object Object],[object Object]
The Tuning Ethos ,[object Object],[object Object],[object Object],[object Object]
The Tuning Ethos ,[object Object],[object Object],[object Object],[object Object],[object Object]
The Tuning Ethos ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Tuning Is Dead We Have The Tuning Advisor !!! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Tuning Is Dead We Have The Tuning Advisor !!! ,[object Object],[object Object],[object Object],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[object Object],[object Object],[object Object],[object Object]
Good And Bad Plans ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[object Object],[object Object],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[object Object],[object Object],[object Object],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[object Object],[object Object],[object Object],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Understanding A Basic Execution Plan ,[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],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[object Object],[object Object],[object Object],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[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],[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],[object Object],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[object Object],[object Object],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[object Object],[object Object],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A Simple ‘Methodology’ For Query Tuning ,[object Object],[object Object],[object Object],[object Object],[object Object]
“ Tuning By Cardinality Feedback” ,[object Object],[object Object],[object Object]
“ Tuning By Cardinality Feedback” ,[object Object],[object Object],[object Object],[object Object],[object Object]
Obtaining Your SQL Text + Binds ,[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],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Checking Predicated Versus Estimated Cardinalities ,[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],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Checking Predicated Versus Estimated Cardinalities ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reasons For Estimated Cardinalities Being Inaccurate ,[object Object],[object Object],[object Object],[object Object],[object Object]
Reasons For Estimated Cardinalities Being Inaccurate ,[object Object],[object Object],[object Object],[object Object],[object Object]
Reasons For Estimated Cardinalities Being Inaccurate ,[object Object],[object Object]
Reasons For Estimated Cardinalities Being Inaccurate ,[object Object],[object Object]
Fixing Bad Cardinality Estimates ,[object Object],[object Object],[object Object],[object Object],[object Object]
Fixing Bad Cardinality Estimates ,[object Object],[object Object],[object Object],[object Object]
Section 3 Worked Examples Of Tuning BY “ Cardinality Feedback ”
A ‘Simple’ Example Of Bad Cardinality Estimate Trouble Shooting ,[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],[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],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A ‘Simple’ Example Of Bad Cardinality Estimate Trouble Shooting ,[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],[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],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A ‘Simple’ Example Of Bad Cardinality Estimate Trouble Shooting ,[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]
A ‘Simple’ Example Of Bad Cardinality Estimate Trouble Shooting ,[object Object],[object Object],[object Object],[object Object],[object Object]
A ‘Simple’ Example Of Bad Cardinality Estimate Trouble Shooting ,[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],[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],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A More Complex Example ,[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],[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],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A ‘Complex’ Example Of Bad Cardinality Estimate Trouble Shooting
[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],[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],[object Object],[object Object],A ‘Complex’ Example Of Bad Cardinality Estimate Trouble Shooting
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A ‘Complex’ Example Of Bad Cardinality Estimate Trouble Shooting
[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],[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],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Trouble Shooting – 1 st Pass
[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],[object Object],Analysis Of 1 st Pass
[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],[object Object],Analysis Of 1 st Pass
[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],[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],[object Object],[object Object],Trouble Shooting - 2 nd Pass
[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],[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],[object Object],[object Object],Trouble Shooting – 3 rd Pass
[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],[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],[object Object],[object Object],Trouble Shooting – 4 th Pass
[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],[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],[object Object],[object Object],[object Object],[object Object],Trouble Shooting – 5 th Pass
[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],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Trouble Shooting – 6 th Pass
[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],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Trouble Shooting – 7 th Pass
[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],Analysis Of 7 th Pass
[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],Analysis Of 7 th Pass
[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],[object Object],[object Object],[object Object],[object Object],[object Object],Analysis Of 7 th Pass
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Analysis Of 7 th Pass
[object Object],[object Object],[object Object],[object Object],[object Object],Analysis Of 7 th Pass
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Analysis Of 7 th Pass
Section 4 Summary & “ Wrap Up ”
Summary ,[object Object],[object Object],[object Object]
Tuning Objectives ,[object Object],[object Object],[object Object]
Tuning By Magic Bullets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Tuning By Hit Ratios ,[object Object],[object Object],[object Object],[object Object]
Hit Ratios According To Tom Kyte ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Hit Ratios According To Tom Kyte ,[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],[object Object],[object Object]
The Fan Hit Ratio ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Tuning By Oracle Marketing ,[object Object],[object Object],[object Object],[object Object],[object Object]
Tuning By The Internet ,[object Object],[object Object]
Tuning By “Problem Scope” ,[object Object],[object Object],[object Object]
Tuning What You Know ,[object Object],[object Object],[object Object],[object Object]
Tuning Is A Moving Target ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Understand Response Time ,[object Object],[object Object],[object Object],[object Object],[object Object]
Tuning Via Flat Statistics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Tuning Via Flat Statistics ,[object Object],[object Object],[object Object],[object Object],[object Object]
Know Your Tool Kit ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Understand Key Object Statistics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Useful Internet Resources ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Oracle Sql Tuning

  • 1. An Introduction To Oracle SQL Tuning Chris Adkin 30 th May 2008
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  • 7. Section 1 Mechanics Of The Cost Based Optimizer
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  • 18. Section 2 A Plan Of Attack For Investigating A Bad Plan
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  • 54. Section 3 Worked Examples Of Tuning BY “ Cardinality Feedback ”
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