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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Index maintenance

While index maintenance is more of a database administration topic than a developer topic, it’s worth discussing the importance of index maintenance. As we discussed in the section on index structure, over time, INSERT, UPDATE, and DELETE operations can cause an index to become fragmented. Once the data is in memory, fragmentation doesn’t cause a noticeable performance issue, so the main concern is I/O. The SQL Database Engine has a few I/O optimizations, such as the readahead mechanism that’s used when scanning an index, that rely on the data being stored contiguously. When the data is fragmented, I/O may not be as efficient.

Another side effect of fragmentation is lower page density. A page is the smallest unit of I/O in the SQL Database Engine, so an index that contains a lot of partially empty pages will generate a lot more I/O than necessary. If the pages are full, it will take fewer of them to store the same amount of data. This is a...

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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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