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Киев 2017
Только реальные кейсы. Только актуальные тренды.
SQL Server Execution
Expectation - Reality
Денис Резник
Киев 2017
About me
• Denis Reznik
• Kyiv, Ukraine
• Data Architect at Intapp, Inc.
• Microsoft Data Platform MVP
• Co-Founder Ukrainian Data Community
• PASS Regional Mentor, Central, and Eastern
Europe
• Author of “SQL Server MVP Deep Dives 2”
Chapter 19
2 |
Киев 2017
Agenda
• Expectation - Reality 1
• Expectation - Reality 2
• Expectation - Reality 3
• Expectation - Reality 4
Parameter Sniffing
Expectation - Reality 1
Киев 2017
EXEC ReportCheckSecurityRequest
@UserId = 1
Query
Processor
SQL Server Cache
Procedure cache
Plan created and cached for the
@UserId = 1
Procedure cache
EXEC ReportCheckSecurityRequest
@UserId = 22
Query executes using the query plan created for
@UserId = 1
Parameter Sniffing - Stored Procedure
Киев 2017
SELECT * FROM Clients WHERE Id = @Id
Query
Processor
SQL Server Cache
Procedure cache
Plan created and cached for the
@Id = 1
Procedure cache
Query executes using the query plan created for
@Id = 1
SELECT * FROM Clients WHERE Id = @Id
sp_executesql N'SELECT * FROM Clients
WHERE Id = @Id', N'@Id int', 1
sp_executesql N'SELECT * FROM Clients
WHERE Id = @Id', N'@Id int', 22
Parameter Sniffing – Parametrized Query
Киев 2017
SELECT * FROM Clients WHERE Id = 1
Query
Processor
SQL Server Cache
Procedure cache
New query plan created and cached. Query
executed using newly created plan.
Procedure cache
SELECT * FROM Clients WHERE Id = 22
New query plan again created and cached. Query
executed using newly created plan.
SELECT * FROM Clients WHERE Id = 1
Query executed using the query plan, created for
the first query.
Procedure cache
Dynamic SQL – Multiple Plans
Index Seek
…
…
1 .. 1M
1 .. 2K 2K+1 .. 4K 1M-2K .. 1M
1 .. 300 301 .. 800 801 .. 1,5K 1,5K+1 .. 2K
SELECT * FROM Users
WHERE Id = 523
Index Scan
…
…
1 .. 1M
1 .. 2K 2K+1 .. 4K 1M-2K .. 1M
1 .. 300 301 .. 800 801 .. 1,5K 1,5K+1 .. 2K
SELECT * FROM Users
DEMO
Parameter Sniffing
Cardinality Estimation
Expectation - Reality 2
Киев 2017
500
1000
10
1200
800
1 800 2000 2800 4500 5400
SELECT * FROM Users
WHERE Id BETWEEN 2100 AND 2500Statistics
SELECT * FROM Users
WHERE Id BETWEEN 10 AND 5300
Киев 2017
500
1000
10
1200
800
1 800 2000 2800 4500 5400
Statistics
SELECT * FROM Users u
INNER JOIN Posts p
ON u.Id = p.OwnerUserId
WHERE u.DisplayName LIKE 'Jeff%'
10600
20000 10
1200 800
A G L S T ZZZZ
Users
Posts
DEMO
Cardinality Estimation
Deadlocks
Expectation - Reality 3
Киев 2017
Lock Types - Shared
S S
X
Киев 2017
Lock Types - Exclusive
X
X
S
Киев 2017
Lock Types - Update
U
U
s
SX
UX
UX
Киев 2017
ID City
1 Kyiv
2 Kharkiv
3 Dnipropetrovsk
BEGIN TRAN
UPDATE Users
SET CityId = 2
WHERE Id = 4
UPDATE City
SET Name = 'Dnipro'
WHERE Id = 3
ID User City_Id
1 John Smith 2
2 Dale Cooper 2
3 Oliver Thompson 2
4 John Dow 3X
BEGIN TRAN
UPDATE City
SET Name = 'Dnipro'
WHERE Id = 3
UPDATE Users
SET CityId = 2
WHERE Id = 4
X
DEADLOCK!
Classic Deadlock
DEMO
Deadlocks
Query Optimization
Expectation - Reality 4
Киев 2017
Query Processing
Parser Procedure
Cache
Algebraizer
Optimizer
Executor
Киев 2017
Optimizer Phase 2 (Last Phase)
Full Set of Optimization Rules
Returns Full Query Plan
• All planned checks were done
• Good Enough Plan was Found
• Timeout
• Not Enough Memory
Optimization
DEMO
Query Optimization
Киев 2017
Summary
• Parameter Sniffing
• Slow in Application. Fast in SSMS.
• Cardinality Estimation
• SQL Server Version Upgrade
• Deadlocks
• Non-Detectable Deadlocks
• Query Optimization
• Query Optimization Timeout
Киев 2017
Thank You!
Denis Reznik
Twitter: @denisreznik
Email: denisreznik@gmail.com
Blog: http://reznik.uneta.com.ua
Facebook: https://www.facebook.com/denis.reznik.5
LinkedIn: http://ua.linkedin.com/pub/denis-reznik/3/502/234

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.NET Fest 2017. Денис Резник. Исполнение Запроса в SQL Server. Ожидание - Реальность

  • 1. Киев 2017 Только реальные кейсы. Только актуальные тренды. SQL Server Execution Expectation - Reality Денис Резник
  • 2. Киев 2017 About me • Denis Reznik • Kyiv, Ukraine • Data Architect at Intapp, Inc. • Microsoft Data Platform MVP • Co-Founder Ukrainian Data Community • PASS Regional Mentor, Central, and Eastern Europe • Author of “SQL Server MVP Deep Dives 2” Chapter 19 2 |
  • 3. Киев 2017 Agenda • Expectation - Reality 1 • Expectation - Reality 2 • Expectation - Reality 3 • Expectation - Reality 4
  • 5. Киев 2017 EXEC ReportCheckSecurityRequest @UserId = 1 Query Processor SQL Server Cache Procedure cache Plan created and cached for the @UserId = 1 Procedure cache EXEC ReportCheckSecurityRequest @UserId = 22 Query executes using the query plan created for @UserId = 1 Parameter Sniffing - Stored Procedure
  • 6. Киев 2017 SELECT * FROM Clients WHERE Id = @Id Query Processor SQL Server Cache Procedure cache Plan created and cached for the @Id = 1 Procedure cache Query executes using the query plan created for @Id = 1 SELECT * FROM Clients WHERE Id = @Id sp_executesql N'SELECT * FROM Clients WHERE Id = @Id', N'@Id int', 1 sp_executesql N'SELECT * FROM Clients WHERE Id = @Id', N'@Id int', 22 Parameter Sniffing – Parametrized Query
  • 7. Киев 2017 SELECT * FROM Clients WHERE Id = 1 Query Processor SQL Server Cache Procedure cache New query plan created and cached. Query executed using newly created plan. Procedure cache SELECT * FROM Clients WHERE Id = 22 New query plan again created and cached. Query executed using newly created plan. SELECT * FROM Clients WHERE Id = 1 Query executed using the query plan, created for the first query. Procedure cache Dynamic SQL – Multiple Plans
  • 8. Index Seek … … 1 .. 1M 1 .. 2K 2K+1 .. 4K 1M-2K .. 1M 1 .. 300 301 .. 800 801 .. 1,5K 1,5K+1 .. 2K SELECT * FROM Users WHERE Id = 523
  • 9. Index Scan … … 1 .. 1M 1 .. 2K 2K+1 .. 4K 1M-2K .. 1M 1 .. 300 301 .. 800 801 .. 1,5K 1,5K+1 .. 2K SELECT * FROM Users
  • 12. Киев 2017 500 1000 10 1200 800 1 800 2000 2800 4500 5400 SELECT * FROM Users WHERE Id BETWEEN 2100 AND 2500Statistics SELECT * FROM Users WHERE Id BETWEEN 10 AND 5300
  • 13. Киев 2017 500 1000 10 1200 800 1 800 2000 2800 4500 5400 Statistics SELECT * FROM Users u INNER JOIN Posts p ON u.Id = p.OwnerUserId WHERE u.DisplayName LIKE 'Jeff%' 10600 20000 10 1200 800 A G L S T ZZZZ Users Posts
  • 16. Киев 2017 Lock Types - Shared S S X
  • 17. Киев 2017 Lock Types - Exclusive X X S
  • 18. Киев 2017 Lock Types - Update U U s SX UX UX
  • 19. Киев 2017 ID City 1 Kyiv 2 Kharkiv 3 Dnipropetrovsk BEGIN TRAN UPDATE Users SET CityId = 2 WHERE Id = 4 UPDATE City SET Name = 'Dnipro' WHERE Id = 3 ID User City_Id 1 John Smith 2 2 Dale Cooper 2 3 Oliver Thompson 2 4 John Dow 3X BEGIN TRAN UPDATE City SET Name = 'Dnipro' WHERE Id = 3 UPDATE Users SET CityId = 2 WHERE Id = 4 X DEADLOCK! Classic Deadlock
  • 22. Киев 2017 Query Processing Parser Procedure Cache Algebraizer Optimizer Executor
  • 23. Киев 2017 Optimizer Phase 2 (Last Phase) Full Set of Optimization Rules Returns Full Query Plan • All planned checks were done • Good Enough Plan was Found • Timeout • Not Enough Memory Optimization
  • 25. Киев 2017 Summary • Parameter Sniffing • Slow in Application. Fast in SSMS. • Cardinality Estimation • SQL Server Version Upgrade • Deadlocks • Non-Detectable Deadlocks • Query Optimization • Query Optimization Timeout
  • 26. Киев 2017 Thank You! Denis Reznik Twitter: @denisreznik Email: denisreznik@gmail.com Blog: http://reznik.uneta.com.ua Facebook: https://www.facebook.com/denis.reznik.5 LinkedIn: http://ua.linkedin.com/pub/denis-reznik/3/502/234