The short answer: in the real world, only the first column works. When SQL Server needs data about the second column, it builds its own stats on that column instead (assuming they don’t already exist), and uses those two statistics together – but they’re not really correlated.
2026-04-29
As a Microsoft Fabric Administrator, you have the responsibility to manage all the Microsoft Enterprise gateways installed and deployed across your entire data estate.
2026-04-27
A dangerous privilege-escalation path exists in SQL Server when cross-database ownership chaining, system database defaults, and overly permissive permissions are combined.
2026-04-24
A SQL Server Agent job can start other jobs. Writing jobs this way makes it easy to compartmentalize jobs: start a “child” job only when the “parent” reaches a certain step. Finding these steps can be challenging. There is no field or property in sysjobs or its associated tables to help find child jobs.
2026-04-22
Pat Wright details how to plan cloud migration with minimal downtime. Learn key cutover strategies, testing methods, and critical questions to avoid data loss and system failure.
2026-04-20
I’m sure I’m not alone when I say, sometimes I get sidetracked. In this particular instance, I hadn’t intended to start learning about User-Defined Types (UDT) in PostgreSQL – I just wanted to test a behavior that involved creating a UDT. But, once I started reading, I was hooked. I mean, four distinct UDTs with different behaviors? That’s pretty cool. Let’s get into it.
2026-04-17
Ever just need a quick visualization of some numbers to get a rough idea of the trend, like this
2026-04-15
Every SQL Server instance contains a database that most people never query, never back up, and never even see in Object Explorer. Yet, without it, SQL Server would not start. Enter the SQL Server Resource database.
2026-04-13
In software development, DevOps promises faster delivery, increased collaboration, and more reliable deployments. However, many teams unknowingly fall into anti-patterns.
2026-04-10
SQL queries can take a long time to run, especially on large tables if not properly indexed. Full table scans can be costly operations when all a user wants is to fetch a few rows based on multiple columns and a WHERE filter. How can we properly index our tables to support multi-column queries?
2026-04-08
Slow-running queries can degrade your Redshift cluster’s performance and lead to increased costs. Identifying...
By gbargsley
If you've been here before, you know this blog is usually about SQL Server,...
I’ve been doing storage load tests for SQL Server for a long time, both...
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In SQL Server 2025, a long I/O is recorded in the error log with message 833. How long much an I/O request be outstanding before this message is written to the log?
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