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Learn T-SQL Querying - Second Edition

You're reading from Learn T-SQL Querying - Second Edition

Product type Book

Published in Feb 2024

Publisher Packt

ISBN-13 9781837638994

Pages 456 pages

Edition 2nd Edition

Languages

Concepts

Database Administration

Authors (2):

Pedro Lopes

Pam Lahoud

View More author details

Table of Contents (18) Chapters

Preface

1. Part 1: Query Processing Fundamentals

2. Chapter 1: Understanding Query Processing

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

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17. Other Books You May Enjoy

Cached query plan issues

As we discussed earlier in the sys.dm_exec_query_stats section, the SQL Database Engine maintains execution statistics for all the queries that are currently in the cache. There is a wealth of information in this DMV that we can use to troubleshoot several different query performance-related issues. We will cover a few issues here, but be sure to reference the BPCheck script in the Tiger Toolbox (https://aka.ms/bpcheck) for a more comprehensive example of queries to identify these scenarios and others.

Single-use plans (query fingerprints)

In the EXECUTE vs. sp_executesql section of Chapter 5, Writing Elegant T-SQL Queries, we discussed how to send ad hoc T-SQL queries to the SQL Database Engine in a way that allows for plan reuse (also see the Plan caching and re-use section in Chapter 1, Understanding Query Processing, for the importance of plan reuse). If we are not sure whether or not our application is successfully parameterizing queries and leveraging...

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Authors (2)

Pedro Lopes

Pedro Lopes is a Program Manager in the Database Systems group, based in Redmond, WA, USA. He has over 19 years of industry experience and has been with Microsoft for 9 years. He is currently responsible for program management of Database Engine features for in-market and vNext versions of SQL Server, with a special focus on the Relational Engine. He has extensive experience with query performance troubleshooting and is a regular speaker at numerous conferences such as SQLBits, PASS Summit, SQLIntersection, Microsoft Ignite, and Microsoft Build. He blogs about SQL on the SQL Server Team blog. He has authored several tools in the Tiger toolbox on GitHub: AdaptiveIndexDefrag maintenance solution, BPCheck, and usp_WhatsUp.

See other products by Pedro Lopes

Pam Lahoud

Pam Lahoud is a Program Manager in the Database Systems group, based in Redmond, WA, USA. She has been with Microsoft for 13 years and is currently responsible for program management of Database Engine features for in-market and vNext versions of SQL Server, with a special focus on the Storage Engine area. She is passionate about SQL Server performance and has focused on performance tuning and optimization, particularly from the developer's perspective, throughout her career. She is a SQL Server 2008 Microsoft Certified Master (MCM) with over 20 years of experience working with SQL Server.

See other products by Pam Lahoud

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