One of the most common items that will cause a memory dump in SQL Server is a non-yielding scheduler (generally referred to as NYS). What the heck does that mean? Why would it cause a memory dump? Is there anything that can be investigated? Good questions, let’s take a look. Stop, Yield, Blinking Yellow… To […]
Issue Introduction In this olved stery the problem comes as a slow database restore. That’s what I was given, that’s all I have. It’s super fun when someone tells you the issue and there is absolutely no information or data around it, right? Questions That Need Answered Why is the “restore slow” What factors, if […]
You’ve won! If, somehow, you’ve managed to see this error in your errorlog then congratulations, you’ve won an instance of SQL Server that probably won’t be doing much. I found out about this message a few months ago, but it has been in the product for years and I went this long without ever even […]
Overall Introduction I’ve had some feedback that people would like to know some of the stuff I see and how I ended up finding the issue and troubleshooting the problem. I present to you a new heading/series called “olved steries”. If you’re wondering, “What is this name and do you not know how to spell?” […]
One of the most common issues I look at from day to day is some variation of the question. “Why did it take a long time for my AG/Database to failover?”. There are many different meanings for this innocuously simple looking statement, for example was it that the failover time was long or was it […]
Departure Hopefully, you’re not finding this entry because you’re scouring the web for what reverting means while your production server is in this state… but chances are, that’s the case. Initiation What is reverting? How did I get here? Is this real life? All great questions. Each time a secondary replica connects to the primary, […]
I tend to be involved in many HA related issues, as is the nature of my current work agreement. The interesting part is that roughly 85% of all the “HA” issues are performance issues (with 10-12% being config issues and the last 3-5% being truly HA issues). Whether this is an FCI, AG, Replication, some […]
Be Careful What You Wish For Just a quick PSA as I’ve had a bunch of questions come up around this since the SQL 2019 CU9 release. You may see these types of items in your errorlog, they are benign. You can safely ignore them. Remember when you said, “Oh I wish I knew more […]
I Think My Knee Hurts, I Just Can’t Prove It Hopefully, you really do know if your knee hurts or not… it’d be odd if you weren’t sure. Regardless, this isn’t about knees but networks and specifically dealing with SQL Server Always On. I’m going to start out by stating that there are many improvements […]
On, Off, On, Off, On… I see this more often than I’d like to, so count this as your PSA (public safety announcement) when using VM level backup software, SQL Server, and even worse when you add in AlwayOn (FCI or AG). You might be familiar with these symptoms which may include: Unresponsive VMs Lease […]
