Performance Tuning

SQLServerCentral Article

SQL Window Functions Series: LAG() and LEAD()

  • Article

Dive deep into the powerful SQL window functions, LAG() and LEAD(). Explore their intricacies, discover real-world examples, and avoid common pitfalls.

(3)

You rated this post out of 5. Change rating

2023-12-11

9,660 reads

SQLServerCentral Article

Comparing Two Execution Plans

  • Article

This is a short look at a technique that I discovered recently in Management Studio (SSMS). The technique is to compare two graphical execution plans in the tool to understand what they are doing and how two different queries might affect a particular system, both with the image and with the properties' data behind the […]

(6)

You rated this post out of 5. Change rating

2023-11-24 (first published: )

10,729 reads

SQLServerCentral Article

Optimize Your SQL by Reformulating the Spec

  • Article

As SQL developers, we tend to think of performance tuning in terms of crafting the best table indices, avoiding scalar and table valued functions, and analyzing query plans (among other things). But sometimes going back to the spec and applying some properties of elementary math can be the best way to begin to improve performance of SQL queries which implement mathematical formulas. This article is a case study of how I used this technique to optimize my SQL implementation of the Inverse Simpson Index.

(3)

You rated this post out of 5. Change rating

2021-05-07 (first published: )

5,394 reads

The Basics - Level 1 of the Stairway to Query Store

  • Stairway Step

Introduction Instead of going straight into the topic of the Query Store, I would like to start this Stairway Series by mentioning a few performance tuning scenarios that are very common to production DBAs. I think most of us have been in one of these situations at some time: An application experiencing slowness after a […]

(5)

You rated this post out of 5. Change rating

2020-10-07 (first published: )

6,898 reads

Blogs

“We love to debate minutiae”

By

I am guilty as charged. The quote was in reference to how people argue...

Advice I Like: Knots

By

Learn how to tie a bowline knot. Practice in the dark. With one hand....

Shifting Mindsets: Why FinOps is Essential for Cloud Efficiency

By

As a DevOps practitioner, I’ve always focused on performance, scalability, and automation. But as...

Read the latest Blogs

Forums

Windows logins for users migrated from DomainA to DomainB

By a.koopman

Hi, I have a SQL Server instance where users connect to via Windows Authentication,...

Multiple Deployment Processes

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Multiple Deployment Processes

How to Use sqlpackage to Detect Schema Drift Between Azure SQL Databases

By Kunal Rathi

Comments posted to this topic are about the item How to Use sqlpackage to...

Visit the forum

Question of the Day

Upgrading Admin Queries

I have a query from a former DBA that we run on SQL Server 2025 to check on database metadata. This query references sys.sysaltfiles. I want to refactor this code to be more modern. Which DMV should I reference instead?  

See possible answers