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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
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Pam Lahoud
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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

Activity Monitor gets new life

Live Query Statistics (LQS) has a viable use case, as we discussed in the Using Live Query Statistics section of this chapter: a previously identified long-running query. But what if we haven’t identified an offending query yet? What if we are the database professional that got that middle-of-the-night call asking us to solve an issue with a business-critical ETL process that runs every night, but is unusually slow today?

Note

ETL is an acronym for Extract-Transform-Load, which is the name given to a process that extracts data from a data source, enacts transformations in that data such as aggregations or calculations, and loads the result into a destination such as a database. A typical example of an ETL process is a SQL Server Agent job that schedules the execution of a SQL Server Integration Services (SSIS) package.

That is where Activity Monitor (AM) comes in. AM is an SSMS feature that’s been there for a long time and has probably...

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