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

Product typeBook

Published inFeb 2024

PublisherPackt

ISBN-139781837638994

Edition2nd Edition

Tools

SQL Server

Concepts

Database Administration

Authors (2):

Pedro Lopes

Pam Lahoud

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Fixing regressed queries

Parameters are fundamental drivers of the query optimization process. We discussed the topic of parameter sensitivity, known as parameter sniffing, in the The importance of parameters section in Chapter 1, Understanding Query Processing, and the Query plan properties of interest section in Chapter 3, Exploring Query Execution Plans.

This brings us to the other main benefit of Query Store: tracking plan changes over time – in other words, regressions from parameter-sensitive plans. With this exercise, we want to make sure the volatility that can come with parameter-sensitive plans is addressed, and that the plan that is used is the one that’s best for most uses, if not all. If successful, we will address the complaints we’ve been getting that sometimes the application just slows down for a few minutes and then recovers.

To generate enough workload in our AdventureWorks database, again, we will use the QueryStoreSimpleDemo.exe application...

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Learn T-SQL Querying - Second Edition

Published in: Feb 2024Publisher: PacktISBN-13: 9781837638994

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.
Read more about 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.
Read more about Pam Lahoud

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Fixing regressed queries

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