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

Cached query plan issues

Single-use plans (query fingerprints)

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