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

Using FORCESEEK and INDEX table hint


A major role of a query optimizer is to choose the best execution plan among the different available plans for query execution. In most of the cases, query optimizer always chooses the right execution plan, and we generally don't need to specify query hints to force the query optimizer to execute a query in a desired way. However, in rare cases, it can happen that query optimizer may fail to choose the right query plan.

SQL Server allows us to specify query hints while writing queries, which forces the query optimizer to execute the query in a specific way only.

In this recipe, we will see how we can force a query to perform an index seek operation by using the FORCESEEK and INDEX table query hints when the query optimizer performs an index scan operation.

Getting ready

In this recipe, we first see that certain ProductIDs cause an index scan operation while retrieving data from the Sales.SalesOrderDetail table. Then we will use the query hints INDEX and...