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Query Performance Tuning: Start to Finish - Home of the Scary DBA
SQL Server 2008 Query Performance Tuning Distilled. Who? 2 ... An
understanding of how the optimizer works in support of writing better TSQL code
as well as ...
Query Performance Tuning: Start to Finish Grant Fritchey
Who? • • • •
Product Evangelist for Red Gate Software Microsoft SQL Server MVP PASS Chapter President Author: – SQL Server Execution Plans – SQL Server 2008 Query Performance Tuning Distilled
2
Why Tune Queries? • • • • •
Most volatile aspect of a database system Subject to changes in data Affected by changes in structure Impacted by poor coding choices Victim of resource contention
3
Finish Line • The ability to collect performance metrics on their servers as part of an overall query tuning methodology • An understanding of how the optimizer works in support of writing better TSQL code as well as troubleshooting poorly performing queries • The ability to generate, read, and understand execution plans from multiple sources in support of troubleshooting poorly performing queries • A working knowledge of DMVs that will help them identify and fix performance issues on their servers • The ability to address common query performance problems
4
Query Performance Tuning – Start to Finish
GATHERING METRICS 5
Finish Line • The ability to collect performance metrics on their servers as part of an overall query tuning methodology • An understanding of how the optimizer works in support of writing better TSQL code as well as troubleshooting poorly performing queries • The ability to generate, read, and understand execution plans from multiple sources in support of troubleshooting poorly performing queries • A working knowledge of DMVs that will help them identify and fix performance issues on their servers • The ability to address common query performance problems
6
Where to Start Tuning? • Random – Pick a query? – Ask a user? – Alphabetically?
• Knowledge based – Baseline – Metrics – Records
7
Server Metrics • Start Query Tuning at the Server – Hardware – Operating System – SQL Server
• Establish a Baseline – Now is a good time – Save the data
8
Tools for the Baseline • • • •
Performance Monitor Dynamic Management Objects (DMO) SQL Data Collection Third Party Software
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