Book Image

Microsoft SQL Server 2012 Performance Tuning Cookbook

Book Image

Microsoft SQL Server 2012 Performance Tuning Cookbook

Overview of this book

As a DBA you must have encountered a slow running application on SQL Server, but there are various factors that could be affecting the performance. If you find yourself in this situation, don't wait, pick up this book and start working towards improving performance of your SQL Server 2012. SQL Server 2012 Performance Tuning Cookbook is divided into three major parts -- Performance Monitoring, Performance Tuning, and Performance Management--that are mandatory to deal with performance in any capacity. SQL Server 2012 Performance Tuning Cookbook offers a great way to manage performance with effective, concise, and practical recipes. You will learn how to diagnose performance issues, fix them, and take precaution to avoid common mistakes. Each recipe given in this book is an individual task that will address different performance aspects to take your SQL Server's Performance to a higher level.The first part of this book covers Monitoring with SQL Server Profiler, DTA, System statistical function, SPs with DBCC commands, Resource Monitor & Reliability, and Performance Monitor and Execution Plan. The second part of the book offers Execution Plan, Dynamic Management Views, and Dynamic Management Functions, SQL Server Cache and Stored Procedure Recompilations, Indexes, Important ways to write effective TSQL, Statistics, Table and Index Partitioning, Advanced Query tuning with Query Hints and Plan Guide, Dealing with Locking, Blocking and Deadlocking and Configuring SQL Server for optimization to boost performance.The third and final part gives you knowledge of performance management with help of Policy Based Management and Management with Resource Governor.
Table of Contents (28 chapters)
Microsoft SQL Server 2012 Performance Tuning Cookbook
Credits
About the Authors
Acknowledgement
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Index

Improving performance by a filtered index


The filtered column index is one of the enhancements of the non-clustered index provided in Microsoft SQL Server 2008, and it is still available in SQL Server 2012. We can consider a simple non-clustered index with the WHERE clause, as a filtered index. A well-defined filtered index reduces maintenance cost and index storage, and improves query performance.

Actually, a non-clustered index, whether it is a covering or include index, indexes all the rows available in a table, whereas a filtered index indexes only those rows that meet the criteria given in the WHERE clause of the CREATE INDEX command. This is the main reason that a filtered index needs low storage and displays improved performance.

Getting ready

It is time to be ready with some information that will be helpful in creating a filtered index. Let us now look into some cases where implementation of a filtered index could be beneficial:

  • A big table with data of many years, but generally used...