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SQL Server Database Engine

Resolved: Login failed for user NT AUTHORITY\ANONYMOUS LOGON – Delegation Step-by-Step

Sometimes when trying to access a linked server, you’d get an error saying “Login failed for user NT AUTHORITY\ANONYMOUS LOGON”. This happens because you’re connected using Windows authentication, and SQL Server fails to “forward” your credentials to the linked server.

Hopefully, with this blog post, I’ll provide you with an easy-to-understand step-by-step guide, which would help you resolve the issue the right way, without any workarounds.

Read More »Resolved: Login failed for user NT AUTHORITY\ANONYMOUS LOGON – Delegation Step-by-Step

Could SQL Injection be dangerous even when perfectly safe?

SQL Injection is something I would expect any reader of my blog to be familiar with. Despite being one of the oldest database attack methods, it still persists for decades on the OWASP Top Ten list of critical security risks to web applications.

In fact, instead of dying out, it only seems to be getting more clever and even automated. With “hacker bots” scouring the web and automatically probing for injection vulnerabilities to exploit. I know, as I’ve once been a victim of such attacks in the past.

But today I’m not actually going to talk about that. Today, I’m going to ask the question: When is SQL Injection dangerous, even if it’s perfectly safe?

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It is 10 PM, do you know where your pages are?

Back in April 2020, I created an open-source project called “SQL Server Page Allocation Reports“. It consisted of a set of SQL queries and some Power BI reports that can be used for visualizing the size and locations of your data and transaction log pages.

Well, recently I also added SSMS Custom Reports into the mix. So, it’s time to revisit this project and see what’s new!

Read More »It is 10 PM, do you know where your pages are?

Keep Your MSDB Clean

As part of its regular, ongoing, day-to-day activities, your SQL Server instance would naturally collect historical data about its automated operations. If left unchecked, this historical data could pile up, leading to wasted storage space, performance hits, and even worse issues.

MSDB would obviously be collecting data about the SQL Agent job executions. But there are also several other types of historical data that needs to be cleaned up once in a while. I hope to cover all bases and leave no historical data un-cleaned.

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Monitoring SQL Server Version Updates using SentryOne

Following the recent acquisition of SentryOne by SolarWinds, I’ve decided to write a few special blog posts dedicated to our favorite SQL server monitoring platform.

Click here if you missed my previous post: Common issues during SentryOne version upgrades.

As part of the managed DBA service that Madeira data solutions provides, we make extensive use of the SentryOne monitoring and alerting platform. As such, we’ve gathered significant experience in using, managing, and maintaining the platform.

This also includes utilizing the platform to do all kinds of “unorthodox” monitoring, which is not available “out-of-the-box”.

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SQL Vulnerability Assessment Tool Reference List – Updated!

Way back at January 16, 2020, I published a blog post containing a reference list for the many rules checked by the SQL Vulnerability Assessment Tool. The next month, I created a separate, dedicated page for the reference list so that it’d be easier to find and maintain. Today I learned that a few months later, around the beginning of May, Microsoft themselves have also published such a reference list on the Microsoft Docs page.

Read More »SQL Vulnerability Assessment Tool Reference List – Updated!