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Oracle Sql Tuning

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Chris Adkin
Chris Adkin

The document discusses tuning SQL queries in Oracle databases. It begins by noting that while tools can help, there is no single process for tuning every query as each case depends on factors like the schema design, data distribution and how the optimizer chooses a plan. The document then provides a methodology for investigating and tuning a query with poor performance, including getting the execution plan, checking it visually, and identifying possible causes like stale statistics, missing indexes or inefficient SQL.

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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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