Exploiting SQL Server Date Correlation Optimization: How Tampered Backups Enable Cross-Database Data Leaks

This article reveals a critical SQL Server flaw: attackers can weaponize Date Correlation Optimization (DCO) views in restored backups

Using REGEXP_COUNT to Count Strings in SQL Server 2025

We need to find out how many times certain strings appear in a column. We’ve used the LEN and REPLACE functions for years, but recently heard about REGEXP_COUNT and want to evaluate it, since we plan to upgrade to SQL Server 2025. How can we test this new feature?

Deciphering Data Architectures

Data fabric, data lakehouse, and data mesh have recently appeared as viable alternatives to the modern data warehouse. These new architectures have solid benefits, but they're also surrounded by a lot of hyperbole and confusion. This practical book provides a guided tour of these architectures to help data professionals understand the pros and cons of each.

• Printed book:
  • US
• Kindle book:
  • US

Common Misconceptions About Microsoft Certification Exams

An experienced exam writer explains common misconceptions about Microsoft certification exams, question design, preparation, and real-world expectations.

How Filters and Sorting can Derail SQL Pagination Performance

In my previous tip, Pagination Performance in SQL Server, I showed how to make SQL pagination more predictable – turning O(n) into O(1). I materialized and cached row numbers to page through instead of calculating them on every request. It wasn’t the whole story, though; real pagination queries rarely get to sort without filtering. Users always want more control, and filtering can threaten that predictability.

Common SQL Server Problems: Invalid Length

This is another part in my series designed to offer guidance around common issues in SQL Server. Today, let’s talk about the all-too-common error: invalid length.

Database Development with AI in 2026

This seems like the appropriate first BrentOzar.com blog post in the year 2026, eh?

Exploiting SQL Server Date Correlation Optimization: How Tampered Backups Enable Cross-Database Data Leaks

This article is a follow-up to SQL Server DBaaS Vulnerability: Decrypting System Code & Exfiltrating User Data, in which we saw some vulnerabilities that affected pretty much all DBaaS offerings available in the cloud. Now, we’ll look at another vulnerability that once again affects every major cloud vendor.

Power BI Quick Reference Guide

I need a structured reference guide to help me get started or expand on Power BI knowledge. I want to be able to bookmark a resource and then use it daily when needed as I build my data sets, reports, and dashboards. Can you please enumerate some common and helpful resources as a Power BI Quick Reference guide?

How to Create a SQL Server Linked Server to Oracle 26ai Free

Easily move data from SQL Server to Oracle 26ai Free with this step-by-step guide.