We've all heard the mantra about the importance of clustered indexes, but what about non-clustered indexes? Do you really need non-clustered indexes or are they just something that consultants recommend to increase their billable hours? In this session, we'll investigate the various flavors of non-clustered indexes and how they can be used to provide significant performance improvements.

1. How Do Non-Clustered
Indexes Improve Performance?

2. Introduction
Jason
Strate
e: jstrate@pragmaticworks.com
e: jasonstrate@gmail.com
b: www.jasonstrate.com
t: StrateSQL
Resources
jasonstrate.com/go/indexing
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3. About Pragmatic Works
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Industry leaders in Microsoft BI and SQL Server
Platform
SQL Server Professionals - PASS Board of Directors,
Speakers, Authors and MVP’s
National Sales Team Divided by Microsoft
Territories
National System Integrator (NSI)
Gold Certified in Business Intelligence and Data
Platform
Platform Modernization/Safe Passage
Premier Partner for PDW SI Partner Program
MS PDW Partner of Year FY13
Frontline Partnership Partner of the Year for Big Data
Executive sponsor - Andy Mouacdie, WW sales director
PDW
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Over 7,200 customers worldwide
Over 186,000 people in PW database for demand
generation
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4. Indexes

5. The “One” Path

6. Other Paths…

8. Agenda
Introduction
Just The
Cluster
Non-Clustered
Index Patterns
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Value of NonClustered
Summary
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9. Introduction
Just The
Cluster
Value of
NonClustered
NonClustered
Index
Patterns
Summary
CLUSTERED INDEX OR HEAP
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10. Introduction
Just The
Cluster
Value of
NonClustered
NonClustered
Index
Patterns
Summary
JUST THE CLUSTER
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11. Clustered
• Default data storage
• Sorted data storage
– One or more columns
– Data and index stored
together
• Fragmentation
• Operations
– Clustered index scan
– Clustered index seek
– Key Lookup

12. The Clustered Index Problem
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13. The Clustered Index Problem
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14. What About Non-Key Columns?
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15. What About Non-Key Columns?
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16. What About Non-Key Columns?
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17. Demo
CLUSTERED INDEX PROBLEM
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18. Left searching for answers…

19. Got Problems?
• Locks
– Lock Escalation
– Blocking
– Deadlocking
• Resource
– CPU
– Memory
– Storage
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20. Introduction
Just The
Cluster
Value of
NonClustered
NonClustered
Index
Patterns
Summary
VALUE OF NON-CLUSTERED
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21. • Sorted key values
–One or more columns
–Key values only
–Pointers to Heap/Clustered
Index rows
• Secondary data access
– Bridge to the data
• Operations
– Index scan
– Index seek
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22. Additional Index Magic
• Included Columns
– Add data pages to index
– Bring in the data pages!
• Filtered Indexes
– Reduce the index pages
• Data Compression
– Row/Page
– Reduce the index pages
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23. The Non-Clustered
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24. What About Non-Key Columns?
SELECT ProductID, OrderQty
FROM Sales.SalesOrderheader
WHERE ProductID = 776
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25. What About Non-Key Columns?
SELECT ProductID, OrderQty
FROM Sales.SalesOrderheader
WHERE ProductID = 716
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26. What About Non-Key Columns?
SELECT ProductID, OrderQty
FROM Sales.SalesOrderheader
WHERE ProductID = 762
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27. Introduction
Just The
Cluster
Value of
NonClustered
NonClustered
Index
Patterns
Summary
NON-CLUSTERED INDEX PATTERNS
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28. Non-Clustered Index Patterns
Cover
Up
Team
Up
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Look
Up
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29. Non-Clustered Index Patterns
Cover
Up
Team
Up
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Look
Up
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30. Non-Clustered Indexes - Cover Up
CREATE INDEX IX_Sample ON
Sales.SalesOrderheader (ProductID)
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31. Non-Clustered Indexes - Cover Up
SELECT ProductID
FROM Sales.SalesOrderheader
WHERE ProductID = 776
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32. Non-Clustered Indexes - Cover Up
SELECT ProductID
FROM Sales.SalesOrderheader
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33. Non-Clustered Indexes - Cover Up
CREATE INDEX IX_Sample ON
Sales.SalesOrderheader (ProductID
,OrderQty)
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34. Non-Clustered Indexes - Cover Up
SELECT ProductID, OrderQty
FROM Sales.SalesOrderheader
WHERE ProductID = 716
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35. Non-Clustered Indexes - Cover Up
SELECT ProductID, OrderQty
FROM Sales.SalesOrderheader
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36. Non-Clustered Index Patterns
Cover
Up
Team
Up
MAKING BUSINESS INTELLIGENT
Look
Up
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37. Non-Clustered Indexes – Look Up
CREATE INDEX IX_Sample ON
Sales.SalesOrderheader (ProductID)
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38. Non-Clustered Indexes – Look Up
SELECT ProductID, CarrierTrackingNumber
FROM Sales.SalesOrderheader
WHERE ProductID = 776
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39. Non-Clustered Indexes – Look Up
SELECT ProductID, CarrierTrackingNumber
FROM Sales.SalesOrderheader
WHERE ProductID = 776
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40. Non-Clustered Index Patterns
Cover
Up
Team
Up
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Look
Up
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41. Non-Clustered Indexes – Team Up
CREATE INDEX IX_Sample ON
Sales.SalesOrderheader (ProductID)
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42. Non-Clustered Indexes – Team Up
CREATE INDEX IX_Sample ON
Sales.SalesOrderheader
(CarrierTrackingNumber)
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43. Non-Clustered Indexes – Team Up
SELECT ProductID, CarrierTrackingNumber
FROM Sales.SalesOrderheader
WHERE ProductID = 776
AND CarrierTrackingNumber = ‘4911-403C-98’
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44. Non-Clustered Indexes – Team Up
SELECT ProductID, CarrierTrackingNumber
FROM Sales.SalesOrderheader
WHERE ProductID = 776
AND CarrierTrackingNumber = ‘4911-403C-98’
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45. Demo
NON-CLUSTERED INDEX PATTERN
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46. Introduction
Just The
Cluster
Value of
NonClustered
NonClustered
Index
Patterns
Summary
SUMMARY
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47. Summary
1. Clustered indexes are not enough
2. Non-clustered indexes provide additional
paths
3. Learn how to leverage all of the properties
4. Performance and stability enhanced through
non-clustered indexes
5. Don’t go overboard… too much of a good
thing
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48. Learn More About Indexes
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49. For more information…
Name: Jason Strate
Email: jstrate@pragmaticworks.com
Blog: www.jasonstrate.com
Resource: jasonstrate.com/go/indexing
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