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SQL Server 2017 Developer???s Guide

You're reading from  SQL Server 2017 Developer???s Guide

Product type Book
Published in Mar 2018
Publisher Packt
ISBN-13 9781788476195
Pages 816 pages
Edition 1st Edition
Languages
Concepts

Table of Contents (25) Chapters

Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
1. Introduction to SQL Server 2017 2. Review of SQL Server Features for Developers 3. SQL Server Tools 4. Transact-SQL and Database Engine Enhancements 5. JSON Support in SQL Server 6. Stretch Database 7. Temporal Tables 8. Tightening Security 9. Query Store 10. Columnstore Indexes 11. Introducing SQL Server In-Memory OLTP 12. In-Memory OLTP Improvements in SQL Server 2017 13. Supporting R in SQL Server 14. Data Exploration and Predictive Modeling with R 15. Introducing Python 16. Graph Database 17. Containers and SQL on Linux 1. Other Books You May Enjoy Index

Query Store use cases

Query Store is a very useful feature and can help you identify and solve some performance problems, and also learn about your workload and to be more familiar with it.

The main use cases are related to issues caused by changed execution plans. Complex queries can have many potential execution plans and some of them can be performant, while others lead to serious performance problems. The Query Optimizer does a great job when it generates execution plans but sometimes it comes up with a suboptimal plan. It is possible that two totally different execution plans have similar costs. When a complex query has a good plan, it can happen that the next plan for the same query performs badly. And the next plan will be generated when the old plan is not in the cache anymore. This happens when SQL Server is upgrading to a new version, when a cumulative update or a Service Pack is installed, when patching is performed, when a failover happens, and also when a new application or service...

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