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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 May 2019
Publisher Packt
ISBN-13 9781789348811
Length 484 pages
Edition 1st Edition
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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. Section 1: Query Processing Fundamentals FREE CHAPTER
2. Anatomy of a Query 3. Understanding Query Processing 4. Mechanics of the Query Optimizer 5. Section 2: Dos and Donts of T-SQL
6. Exploring Query Execution Plans 7. Writing Elegant T-SQL Queries 8. Easily-Identified T-SQL Anti-Patterns 9. Discovering T-SQL Anti-Patterns in Depth 10. Section 3: Assemble Your Query Troubleshooting Toolbox
11. Building Diagnostic Queries Using DMVs and DMFs 12. Building XEvent Profiler Traces 13. Comparative Analysis of Query Plans 14. Tracking Performance History with Query Store 15. Troubleshooting Live Queries 16. Managing Optimizer Changes with the Query Tuning Assistant 17. Other Books You May Enjoy

Summary

This chapter covered the important topic of tracking query progress, and how to use either LQS to see the live progress of a single query in SSMS, or Activity Monitor to access the live progress of any running query. We also covered how these tools and the underlying Database Engine features are invaluable to troubleshoot and solve query performance issues, namely for those queries that take hours to complete, or never do complete.

The Query Profiling Infrastructures available in SQL Server depend on the Database Engine version. The following table summarizes the available options to enable either of the Query Profiling Infrastructures and the minimum required version for each option:

Where to enable Standard Profiling Lightweight Profiling

Globally

XEvent session with query_post_execution_showplan XE;
Starting with SQL Server 2012

XEvent session with...

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