Getting Started Reading Execution Plans

•

1 recomendación•856 vistas

Grant Fritchey

Software Tecnología

Grant Fritchey | www.ScaryDBA.com
Goals
 Learn the best places to start at when reading an
execution plan and why you should start there.
 Take away methods for querying directly against the
execution plans that will make you faster at reading
the plans.
 Understand how to drill down on the information
within plans to arrive at a better understanding of
why the optimizer is making these query plans.

Grant Fritchey | www.ScaryDBA.com
grant@scarydba.com www.scarydba.com
@gfritchey www.linkedin.com/in/scarydba
Grant Fritchey
Product Evangelist, Red Gate Software

Grant Fritchey | www.ScaryDBA.com
Why Execution Plans?
 Best tool for #1 performance problem
» Poor code choices
» Poor structure choices
» Bad/out of date/missing statistics
 Single best window into decisions made by the
query optimizer
 Only way to know “What Happened” when you ran
a query
4

Grant Fritchey | www.ScaryDBA.com
Generating a Plan
 SQL Server Management Studio
» Estimated
» Actual
 Procedure Cache
» Estimated (sort of)
 Extended Events
» Estimated
» Actual
 Trace Events (not recommended)
» Estimated
» Actual

Grant Fritchey | www.ScaryDBA.com
Where To Start?

Grant Fritchey | www.ScaryDBA.com
First Operator
 Plan size
 Compile time
 Memory grant
 Missing Indexes
 Optimization level
 Parameter
» Compiled value
» RuntimeValue
 Query hash
 Reason for early termination
 ANSI settings

Grant Fritchey | www.ScaryDBA.com
Right to Left or Left to Right?
 A clue: English
 Another clue:These things

Grant Fritchey | www.ScaryDBA.com
Left to Right or Right to Left
 Answer: Both
 Logical processing order:
» Represents how the optimizer sees the query
» Reading it from Left to Right
 Physical processing order
» Represents the flow of data
» Follow the arrows/pipes from Right to Left
 Both are necessary to understand certain plans

Grant Fritchey | www.ScaryDBA.com
What Else to Look For
 Warnings
 Most Costly Operations
 Fat Pipes
 Extra Operations
 Scans
 Estimated vs. Actual

Grant Fritchey | www.ScaryDBA.com
Where to Look
 Tool tips
» Eh
 Properties
» Lots of Details

Grant Fritchey | www.ScaryDBA.com
DEMO
13

Grant Fritchey | www.ScaryDBA.com
Query For The Plan
 Sys.dm_exec_query_plan
 Cache dependent
SELECT deps.type_desc,
deps.last_execution_time,
deps.execution_count,
deps.total_logical_reads,
dest.encrypted AS EncryptedText,
dest.text,
deqp.query_plan,
deqp.encrypted AS EncryptedPlan
FROM sys.dm_exec_procedure_stats AS deps
CROSS APPLY sys.dm_exec_sql_text(deps.sql_handle) AS dest
CROSS APPLY sys.dm_exec_query_plan(deps.plan_handle) AS deqp
WHERE dest.text LIKE 'CREATE PROCEDURE dbo.GetSalesDetails%';

Grant Fritchey | www.ScaryDBA.com
Query the Plan
 Standard execution plans are all XML
 XML can be queried
 XQuery
WITH XMLNAMESPACES(DEFAULT
N'http://schemas.microsoft.com/sqlserver/2004/07/showplan'),
QueryPlans AS
(
SELECT RelOp.pln.value(N'@PhysicalOp', N'varchar(50)') AS
OperatorName,
RelOp.pln.value(N'@NodeId',N'integer') AS NodeId,
RelOp.pln.value(N'@EstimateCPU', N'decimal') AS CPUCost,
RelOp.pln.value(N'@EstimateIO', N'float') AS IOCost
FROM @QueryPlan.nodes(N'//RelOp') RelOp (pln)
)

Grant Fritchey | www.ScaryDBA.com
DEMO
DemoTitle
Subtitle

Grant Fritchey | www.ScaryDBA.com
References
 PerformanceTuning with SQL Server Dynamic
ManagementViews
» Louis Davidson andTim Ford
 SQL Server Execution Plans | Second Edition
 SQL Server 2012 Internals
» Kalen Delaney, Bob Beauchemin, Conor
Cunningham, Jonathan Kehayias, Paul Randal,
Benjamin Nevarez
 SQL Server 2012 Query PerformanceTuning

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Getting Started Reading Execution Plans

1. Grant Fritchey | www.ScaryDBA.com www.ScaryDBA.com Getting Started Reading Execution Plans Grant Fritchey grant@scarydba.com

2. Grant Fritchey | www.ScaryDBA.com Goals  Learn the best places to start at when reading an execution plan and why you should start there.  Take away methods for querying directly against the execution plans that will make you faster at reading the plans.  Understand how to drill down on the information within plans to arrive at a better understanding of why the optimizer is making these query plans.

3. Grant Fritchey | www.ScaryDBA.com grant@scarydba.com www.scarydba.com @gfritchey www.linkedin.com/in/scarydba Grant Fritchey Product Evangelist, Red Gate Software

4. Grant Fritchey | www.ScaryDBA.com Why Execution Plans?  Best tool for #1 performance problem » Poor code choices » Poor structure choices » Bad/out of date/missing statistics  Single best window into decisions made by the query optimizer  Only way to know “What Happened” when you ran a query 4

5. Grant Fritchey | www.ScaryDBA.com Generating a Plan  SQL Server Management Studio » Estimated » Actual  Procedure Cache » Estimated (sort of)  Extended Events » Estimated » Actual  Trace Events (not recommended) » Estimated » Actual

6. Grant Fritchey | www.ScaryDBA.com Where To Start?

7. Grant Fritchey | www.ScaryDBA.com Where To Start?

8. Grant Fritchey | www.ScaryDBA.com First Operator  Plan size  Compile time  Memory grant  Missing Indexes  Optimization level  Parameter » Compiled value » RuntimeValue  Query hash  Reason for early termination  ANSI settings

9. Grant Fritchey | www.ScaryDBA.com Right to Left or Left to Right?  A clue: English  Another clue:These things

10. Grant Fritchey | www.ScaryDBA.com Left to Right or Right to Left  Answer: Both  Logical processing order: » Represents how the optimizer sees the query » Reading it from Left to Right  Physical processing order » Represents the flow of data » Follow the arrows/pipes from Right to Left  Both are necessary to understand certain plans

11. Grant Fritchey | www.ScaryDBA.com What Else to Look For  Warnings  Most Costly Operations  Fat Pipes  Extra Operations  Scans  Estimated vs. Actual

12. Grant Fritchey | www.ScaryDBA.com Where to Look  Tool tips » Eh  Properties » Lots of Details

13. Grant Fritchey | www.ScaryDBA.com DEMO 13

14. Grant Fritchey | www.ScaryDBA.com Query For The Plan  Sys.dm_exec_query_plan  Cache dependent SELECT deps.type_desc, deps.last_execution_time, deps.execution_count, deps.total_logical_reads, dest.encrypted AS EncryptedText, dest.text, deqp.query_plan, deqp.encrypted AS EncryptedPlan FROM sys.dm_exec_procedure_stats AS deps CROSS APPLY sys.dm_exec_sql_text(deps.sql_handle) AS dest CROSS APPLY sys.dm_exec_query_plan(deps.plan_handle) AS deqp WHERE dest.text LIKE 'CREATE PROCEDURE dbo.GetSalesDetails%';

15. Grant Fritchey | www.ScaryDBA.com Query the Plan  Standard execution plans are all XML  XML can be queried  XQuery WITH XMLNAMESPACES(DEFAULT N'http://schemas.microsoft.com/sqlserver/2004/07/showplan'), QueryPlans AS ( SELECT RelOp.pln.value(N'@PhysicalOp', N'varchar(50)') AS OperatorName, RelOp.pln.value(N'@NodeId',N'integer') AS NodeId, RelOp.pln.value(N'@EstimateCPU', N'decimal') AS CPUCost, RelOp.pln.value(N'@EstimateIO', N'float') AS IOCost FROM @QueryPlan.nodes(N'//RelOp') RelOp (pln) )

16. Grant Fritchey | www.ScaryDBA.com DEMO DemoTitle Subtitle

17. Grant Fritchey | www.ScaryDBA.com References  PerformanceTuning with SQL Server Dynamic ManagementViews » Louis Davidson andTim Ford  SQL Server Execution Plans | Second Edition  SQL Server 2012 Internals » Kalen Delaney, Bob Beauchemin, Conor Cunningham, Jonathan Kehayias, Paul Randal, Benjamin Nevarez  SQL Server 2012 Query PerformanceTuning

18. Grant Fritchey | www.ScaryDBA.com Goals  Learn the best places to start at when reading an execution plan and why you should start there.  Take away methods for querying directly against the execution plans that will make you faster at reading the plans.  Understand how to drill down on the information within plans to arrive at a better understanding of why the optimizer is making these query plans.

Getting Started Reading Execution Plans

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