Basic Execution PlansEugene Meidinger

emeidinger@all-lines-tech.com@sqlgene

www.sqlgene.com

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Who am I?• Accidental DBA• Graduated Penn State 2010 for IST• First Job was in BI department at Bayer• Head of small BI department at FF/ALT/Lantek• Certified in Querying SQL Server 2012• Started speaking a year ago

– Don’t go to the SQL Saturday after event! You’ll get drafted

• Not an expert, just know enough to speak

What are we going to talk about?• What is an execution Plan• How to view an execution plan• What does a plan look like• How to read one• Demo• Resources• Q/A

What is an execution plan?• Instructions for how to process a query

– Can think of it as a recipe

• Created by query optimizer at run time• Execution plans are cached after the first run• Many different ways to process the same query

– For trivial queries, a simple plan is used– Can be forced with hints– Don’t try to outsmart the database engine

How to view the execution plan?• Go to Query

– Click Include Actual Execution Plan

• Or, Press Ctrl + M• Or click the Execution Plan Icon on the tool bar

What does a plan look like?

How to read an execution plan• Read from right to left and top to bottom• Icons represent operators

– Operators have cost below them in %

• Arrows represent data flow– Bigger arrows represent more data

• Hover over icons and arrows for more detail

Demo

Demo code.sql

Resources Adventure Works Database Execution Plan Basics by Grant Fritchey SQL Server Execution Plans, Second Edition by Grant Fritchey Watch Brent Ozar Tune Queries by Brent Ozar

Questions?Thank you!