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mysql 性能优化 How to Analyze and Tune SQL Queries for Better Perfor

mysql

sql

性能优化

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mysql 性能优化

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Øystein Grøvlen

Senior Principal Software Engineer

MySQL Optimizer Team, Oracle

February 25, 2015

How to Analyze and Tune MySQL

Queries for Better Performance

Program Agenda

Introduction to MySQL cost-based optimizer

Selecting data access method

Join optimizer

Sorting

Tools for monitoring, analyzing, and tuning queries

Influencing the Optimizer

Program Agenda

Introduction to MySQL optimizer

Selecting data access method

Join optimizer

Sorting

Tools for monitoring, analyzing, and tuning queries

Influencing the Optimizer

MySQL Optimizer

SELECT a, b

FROM t1, t2, t3

WHERE t1.a = t2.b

AND t2.b = t3.c

AND t2.d > 20

AND t2.d < 30;

MySQL Server

Cost based

optimizations

Heuristics

Cost Model

Optimizer

Table/index info

(data dictionary)

Statistics

(storage engine)

Table

scan

Range

scan

Ref

access

JOIN

Cost-based Query Optimization

• Assign cost to operations

• Computes cost of partial or alternative plans

• Search for plan with lowest cost

• Cost-based optimizations:

General idea

Access method

Subquery strategy Join order

Table

scan

Range

scan

Ref

access

JOIN

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