1. The Ins and Outs of Indexes
Indexing Basics in SQL Server
Mindy Curnutt
Mindy Curnutt & Associates Consulting
Microsoft Data Platform MVP

2. About Me Independent Consultant 3X SQL Server/Data Platform MVP
Idera Ace
SQL Server since 6.5 / 1995 (22 Years)
PASS Summit Speaker, 2005,
PASS Program Manager

3. Thank You Idera! My speaking to you today was made possible through
the Idera ACE program.

4. Agenda
Objectives
Clustered Indexes
Non Clustered Indexes

5. 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

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

7. Agenda
Objectives
Clustered Indexes
Non Clustered Indexes

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

9. Clustered Indexes Desired Qualities Narrow Data Type Unique Static
Increasing

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

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

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

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

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

15. Agenda
Objectives
Clustered Indexes
Non Clustered Indexes

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

17. Bookmark (Key/RID) Lookup

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

19. Questions?
Mindy Curnutt