How Do Non-Clustered Indexes Improve Performance?
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The document discusses the role of non-clustered indexes in improving database performance, highlighting their value as additional access paths and their ability to enhance performance and stability. It provides insights into different index patterns and techniques, such as included columns and filtered indexes, while emphasizing the importance of not overusing indexes. The author, Jason Strate, offers resources and additional information for those looking to leverage indexing in their Microsoft BI and SQL Server environments.
How Do Non-Clustered Indexes Improve Performance?
- 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 MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 3. About Pragmatic Works • • • • • • • 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 • • Over 7,200 customers worldwide Over 186,000 people in PW database for demand generation MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 4. Indexes
- 6. Other Paths…
- 8. Agenda Introduction Just The Cluster Non-Clustered Index Patterns MAKING BUSINESS INTELLIGENT Value of NonClustered Summary www.pragmaticworks.com
- 9. Introduction Just The Cluster Value of NonClustered NonClustered Index Patterns Summary CLUSTERED INDEX OR HEAP MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 10. Introduction Just The Cluster Value of NonClustered NonClustered Index Patterns Summary JUST THE CLUSTER MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 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 MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 13. The Clustered Index Problem MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 14. What About Non-Key Columns? MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 15. What About Non-Key Columns? MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 16. What About Non-Key Columns? MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 17. Demo CLUSTERED INDEX PROBLEM MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 18. Left searching for answers…
- 19. Got Problems? • Locks – Lock Escalation – Blocking – Deadlocking • Resource – CPU – Memory – Storage MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 20. Introduction Just The Cluster Value of NonClustered NonClustered Index Patterns Summary VALUE OF NON-CLUSTERED MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 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 MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 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 MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 23. The Non-Clustered MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 24. What About Non-Key Columns? SELECT ProductID, OrderQty FROM Sales.SalesOrderheader WHERE ProductID = 776 MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 25. What About Non-Key Columns? SELECT ProductID, OrderQty FROM Sales.SalesOrderheader WHERE ProductID = 716 MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 26. What About Non-Key Columns? SELECT ProductID, OrderQty FROM Sales.SalesOrderheader WHERE ProductID = 762 MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 27. Introduction Just The Cluster Value of NonClustered NonClustered Index Patterns Summary NON-CLUSTERED INDEX PATTERNS MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 28. Non-Clustered Index Patterns Cover Up Team Up MAKING BUSINESS INTELLIGENT Look Up www.pragmaticworks.com
- 29. Non-Clustered Index Patterns Cover Up Team Up MAKING BUSINESS INTELLIGENT Look Up www.pragmaticworks.com
- 30. Non-Clustered Indexes - Cover Up CREATE INDEX IX_Sample ON Sales.SalesOrderheader (ProductID) MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 31. Non-Clustered Indexes - Cover Up SELECT ProductID FROM Sales.SalesOrderheader WHERE ProductID = 776 MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 32. Non-Clustered Indexes - Cover Up SELECT ProductID FROM Sales.SalesOrderheader MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 33. Non-Clustered Indexes - Cover Up CREATE INDEX IX_Sample ON Sales.SalesOrderheader (ProductID ,OrderQty) MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 34. Non-Clustered Indexes - Cover Up SELECT ProductID, OrderQty FROM Sales.SalesOrderheader WHERE ProductID = 716 MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 35. Non-Clustered Indexes - Cover Up SELECT ProductID, OrderQty FROM Sales.SalesOrderheader MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 36. Non-Clustered Index Patterns Cover Up Team Up MAKING BUSINESS INTELLIGENT Look Up www.pragmaticworks.com
- 37. Non-Clustered Indexes – Look Up CREATE INDEX IX_Sample ON Sales.SalesOrderheader (ProductID) MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 38. Non-Clustered Indexes – Look Up SELECT ProductID, CarrierTrackingNumber FROM Sales.SalesOrderheader WHERE ProductID = 776 MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 39. Non-Clustered Indexes – Look Up SELECT ProductID, CarrierTrackingNumber FROM Sales.SalesOrderheader WHERE ProductID = 776 MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 40. Non-Clustered Index Patterns Cover Up Team Up MAKING BUSINESS INTELLIGENT Look Up www.pragmaticworks.com
- 41. Non-Clustered Indexes – Team Up CREATE INDEX IX_Sample ON Sales.SalesOrderheader (ProductID) MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 42. Non-Clustered Indexes – Team Up CREATE INDEX IX_Sample ON Sales.SalesOrderheader (CarrierTrackingNumber) MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 43. Non-Clustered Indexes – Team Up SELECT ProductID, CarrierTrackingNumber FROM Sales.SalesOrderheader WHERE ProductID = 776 AND CarrierTrackingNumber = ‘4911-403C-98’ MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 44. Non-Clustered Indexes – Team Up SELECT ProductID, CarrierTrackingNumber FROM Sales.SalesOrderheader WHERE ProductID = 776 AND CarrierTrackingNumber = ‘4911-403C-98’ MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 45. Demo NON-CLUSTERED INDEX PATTERN MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 46. Introduction Just The Cluster Value of NonClustered NonClustered Index Patterns Summary SUMMARY MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 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 MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 48. Learn More About Indexes MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 49. For more information… Name: Jason Strate Email: jstrate@pragmaticworks.com Blog: www.jasonstrate.com Resource: jasonstrate.com/go/indexing Products BI products to covert to a Microsoft BI platform and simplify development on the platform. Services Speed development through training, and rapid development services from Pragmatic Works. Foundation Helping those who do not have the means to get into information technology achieve their dreams.