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Learn T-SQL Querying

You're reading from   Learn T-SQL Querying A guide to developing efficient and elegant T-SQL code

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Product type Paperback
Published in Feb 2024
Publisher Packt
ISBN-13 9781837638994
Length 456 pages
Edition 2nd Edition
Languages
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Authors (2):
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Pedro Lopes Pedro Lopes
Author Profile Icon Pedro Lopes
Pedro Lopes
Pam Lahoud Pam Lahoud
Author Profile Icon Pam Lahoud
Pam Lahoud
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Toc

Table of Contents (18) Chapters Close

Preface 1. Part 1: Query Processing Fundamentals
2. Chapter 1: Understanding Query Processing FREE CHAPTER 3. Chapter 2: Mechanics of the Query Optimizer 4. Part 2: Dos and Don’ts of T-SQL
5. Chapter 3: Exploring Query Execution Plans 6. Chapter 4: Indexing for T-SQL Performance 7. Chapter 5: Writing Elegant T-SQL Queries 8. Chapter 6: Discovering T-SQL Anti- Patterns in Depth 9. Part 3: Assembling Our Query Troubleshooting Toolbox
10. Chapter 7: Building Diagnostic Queries Using DMVs and DMFs 11. Chapter 8: Building XEvent Profiler Traces 12. Chapter 9: Comparative Analysis of Query Plans 13. Chapter 10: Tracking Performance History with Query Store 14. Chapter 11: Troubleshooting Live Queries 15. Chapter 12: Managing Optimizer Changes 16. Index 17. Other Books You May Enjoy

Summary

From the set of regressed workloads that the SQL Database Engine team has handled over the years, the initial scenarios covered by QTA and CE Feedback are some of the most common after a database compatibility level upgrade (and, therefore, a CE upgrade), which can make users question whether to upgrade. But that is just because when upgrading from an old version, such as SQL Server 2008 or 2012, our T-SQL queries were fully tuned to the only CE model set that existed at the time. When some aspects of cardinality estimation changed, there was a possibility that some queries would have to be tuned for the new models. Fortunately, the SQL Database Engine team believes that backward compatibility is an asset in the SQL Database Engine and included these hints, which allow selective tuning opportunities for the scenarios covered by QTA and CE Feedback, as well as others less common not covered by QTA nor CE Feedback.

Whether you choose to use QTA or not, following the recommended...

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