Book Image

SQL Server 2017 Developer???s Guide

Book Image

SQL Server 2017 Developer???s Guide

Overview of this book

Microsoft SQL Server 2017 is a milestone in Microsoft's data platform timeline, as it brings in the power of R and Python for machine learning and containerization-based deployment on Windows and Linux. This book prepares you for advanced topics by starting with a quick introduction to SQL Server 2017's new features. Then, it introduces you to enhancements in the Transact-SQL language and new database engine capabilities before switching to a different technology: JSON support. You will take a look at the security enhancements and temporal tables. Furthermore, the book focuses on implementing advanced topics, including Query Store, columnstore indexes, and In-Memory OLTP. Toward the end of the book, you'll be introduced to R and how to use the R language with Transact-SQL for data exploration and analysis. You'll also learn to integrate Python code into SQL Server and graph database implementations as well as the deployment options on Linux and SQL Server in containers for development and testing. By the end of this book, you will be armed to design efficient, high-performance database applications without any hassle.
Table of Contents (25 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Free Chapter
1
Introduction to SQL Server 2017
Index

Chapter 9. Query Store

Query Store is a new performance troubleshooting tool, fully integrated into the database engine. In my opinion, it is one of the best database engine features since 2005 and the introduction of OPTION(RECOMPILE). Query Store helps you to troubleshoot query performance by collecting information about queries, resource utilization, execution plans, and the other execution parameters. This information is stored in a database and therefore it survives server crashes, restarts, and failovers.

Query Store not only helps you to identify issues with query executions, but also lets you easily and quickly fix or work-around problems caused by poorly chosen execution plans. This fix can even be done automatically.

In this chapter, you will learn about the following points:

  • Why Query Store has been introduced
  • What Query Store is intended for and what it is not
  • Query Store architecture
  • How Query Store can help you to quickly identify and solve performance issues
  • Automatic tuning in SQL...