The Ins and Outs of Indexes Indexing Basics in SQL Server Mindy Curnutt TMW Systems, Inc. VP, Information Management SQL Server MVP Twitter: @sqlgirl

About Me VP, Information Management, TMW 3X SQL Server/Data Platform MVP Idera Ace 2016-2017 SQL Server since 6.5 / 1995 (20 Years) PASS Summit Speaker, 2005, 2012-2015 PASS Program Manager 2015-2017 Twitter: @sqlgirl Email: mindycurnutt@hotmail.com

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Agenda Objectives Clustered Indexes Non Clustered Indexes

Objectives Understand how to create effective and efficient indexes Clustered Index Learn what are they and why important? Non Clustered Indexes When and how are they used? What are Included Columns? Uniqueness Why you should care

Types of Indexes The Basics Clustered Non Clustered Unique Getting Fancy (not in this presentation) Filtered Full-Text Spatial XML

Agenda Objectives Clustered Indexes Non Clustered Indexes

Clustered Indexes Clustered Index – sort order of the data within the table on the hard drive and in memory. One per table

Clustered Indexes Desired Qualities Narrow Data Type Unique Static Increasing

Clustered Indexes Narrow Data Type Less Data Duplicated Smaller… Databases Backups Maintenance Plan Times Scans

Clustered Indexes Unique Not Required Prevents Uniqueifier Best to be Narrow…remember?

Clustered Indexes Static Changes cause… Additional overhead for Non Clustered Indexes Clustered Index Fragmentation A Bit of Advice? Bad Idea

Clustered Indexes Increasing Data is added to the end of the index Reduces fragmentation

Clustered Indexes Demos No Clustered Index (Heap) Non Unique Clustered Index Unique Clustered Index

Agenda Objectives Clustered Indexes Non Clustered Indexes

Non Clustered Indexes For Common Queries Link to Clustered Indexes or Heap through Key or RID Bookmark Lookup

Bookmark (Key/RID) Lookup

Non Clustered Indexes Demo Bookmark (Key/RID) Lookup Covering Index

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