how do non-clustered indexes improve performance?

How Do Non-Clustered Indexes Improve Performance?

Jason Strate

e: [email protected]

e: [email protected]

b: www.jasonstrate.com

t: StrateSQL

Resources jasonstrate.com/go/indexing

Introduction

MAKING BUSINESS INTELLIGENT www.pragmaticworks.com


• 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 FY13Frontline Partnership Partner of the Year for Big DataExecutive sponsor - Andy Mouacdie, WW sales director PDW

• Over 7,200 customers worldwide• Over 186,000 people in PW database for demand

generation

About Pragmatic Works

Indexes

The “One” Path

Other Paths…

Agenda

Introduction Just The Cluster

Value of Non-Clustered

Non-Clustered Index Patterns

Summary


CLUSTERED INDEX OR HEAP

IntroductionJust The Cluster

Value of Non-

Clustered

Non-Clustered

Index Patterns

Summary


JUST THE CLUSTER


Value of Non-

Clustered

Non-Clustered

Index Patterns

Summary


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

The Clustered Index Problem


What About Non-Key Columns?


CLUSTERED INDEX PROBLEMDemo


Left searching for answers…

Got Problems?


• Locks

– Lock Escalation

– Blocking

– Deadlocking

• Resource

– CPU

– Memory

– Storage

VALUE OF NON-CLUSTERED


Value of Non-

Clustered

Non-Clustered

Index Patterns

Summary


• Sorted key values–One or more columns

–Key values only

–Pointers to Heap/ClusteredIndex rows

• Secondary data access– Bridge to the data

• Operations– Index scan– Index seek


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


The Non-Clustered




SELECT ProductID, OrderQty

FROM Sales.SalesOrderheader

WHERE ProductID = 776

NON-CLUSTERED INDEX PATTERNS


Value of Non-

Clustered

Non-Clustered

Index Patterns

Summary




Cover Up

Look Up

Team Up

Non-Clustered Indexes - Cover Up


CREATE INDEX IX_Sample ON

Sales.SalesOrderheader (ProductID)



SELECT ProductID






Sales.SalesOrderheader (ProductID

,OrderQty)



Cover Up

Look Up

Team Up

Non-Clustered Indexes – Look Up




Non-Clustered Indexes – Look Up


SELECT ProductID, CarrierTrackingNumber





Cover Up

Look Up

Team Up

Non-Clustered Indexes – Team Up







Sales.SalesOrderheader

(CarrierTrackingNumber)



SELECT ProductID, CarrierTrackingNumber



AND CarrierTrackingNumber = ‘4911-403C-98’

NON-CLUSTERED INDEX PATTERNDemo


SUMMARY


Value of Non-

Clustered

Non-Clustered

Index Patterns

Summary


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


Learn More About Indexes


ServicesSpeed development through training, and rapid development services from Pragmatic Works.

ProductsBI products to covert to a Microsoft BI platform and simplify development onthe platform.

FoundationHelping those who do not have themeans to get into information technologyachieve their dreams.

For more information…

Name: Jason Strate

Email: [email protected]

Blog: www.jasonstrate.com

Resource: jasonstrate.com/go/indexing

how do non-clustered indexes improve performance?

Technology

business intelligentlook

business intelligence

clustermaking business

heapmaking business

comgoindexingmaking

nonkey columns

columns data

additional index magic