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String Aggregation Over the Years in SQL Server
Since SQL Server 2005, the trick of using FOR XML PATH to denormalize strings and combine them into a single (usually comma-separated) list has been very popular. In SQL Server 2017, however,...
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Matching Supply With Demand — Solutions, Part 3
[ Jump to: Original challenge | Solutions: Part 1 | Part 2 | Part 3 ] In this article, I continue exploring solutions to the matching supply with demand challenge. Thanks to Luca, Kamil Kosno, Daniel...
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Simple Parameterization and Trivial Plans — Part 1
This is the first part of a series about simple parameterization and trivial plans. These two compilation features are closely connected and have similar goals. Both target performance and efficiency...
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Simple Parameterization and Trivial Plans — Part 2
Parameter Data Types As mentioned in the first part of this series, one of the reasons it is better to explicitly parameterize is so you have full control over parameter data types. Simple...
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Islands T-SQL Challenge
Recently, I was introduced to a new islands challenge by my friend Erland Sommarskog. It’s based on a question from a public database forum. The challenge itself isn’t complicated to handle when using...
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Simple Parameterization and Trivial Plans — Part 3
Execution Plans It’s more complicated than you might expect to tell from the information provided in execution plans if a SQL statement uses simple parameterization. It’s no surprise even highly...
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Simple Parameterization and Trivial Plans — Part 4
[ This series: Part 1 | Part 2 | Part 3 | Part 4 ] The Compilation Process The most important things to understand about server-side parameterization are it doesn’t happen all at once and a final...
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T-SQL Windowing Improvements in SQL Server 2022
Microsoft recently released the first public preview of SQL Server 2022. This release has a number of T-SQL improvements. In this article I focus on windowing and NULL-related improvements. These...
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T-SQL Can Be Expressive Without Sacrificing Performance
Even with its warts and limitations, Transact-SQL is a beautiful language, allowing for flexible declarative expression about what you’re asking the database engine to do for you. Itzik Ben-Gan has...
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Simple Parameterization and Trivial Plans — Part 5
[ This series: Part 1 | Part 2 | Part 3 | Part 4 | Part 5 ] In part 4, I described the role the parser plays turning a statement with constant values into a parameterized prepared statement. To recap...
View Article10 For 10 : My 10 Favorite SQLPerformance Posts Over 10 Years
This is a month of milestones. I was awarded my 25th MVP award on July 5th, which I believe ties me with Tibor for the longest-tenured MVP. SQL Server 2012 went out of all forms of official support...
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Simple Parameterization and Trivial Plans — Part 6
[ This series: Part 1 | Part 2 | Part 3 | Part 4 | Part 5 | Part 6 ] In part 5, I described how the early phases of query compilation affect simple parameterization. To recap: Normalization and...
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The Lock Escalation Threshold – Part 1
This article isn’t about the act of lock escalation itself, which is already well documented and generally well understood. Some myths (like row locks escalating to page locks) persist, but challenging...
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