Hey Dispatch, We Have a Code 8 If you’ve been following with the series of demystifying dumps then you’re probably thinking or have thought something along the lines of, “All of these issues seem to be around stalled or non-yielding things…” and you’d be correct. If you revisit the non-yielding scheduler dump post, I explain […]
What’s an IOCP? IO Completion Ports are a set of Windows APIs which allow for efficient, fast, multithreaded asynchronous IO. Great, that pretty much tells you nothing. SQL Server uses IO Completion Ports not for disk-based IO but for general network IO when it comes into SQL Server for TDS level items. This means it’s […]
Initially I thought to myself, “this is the most misunderstood wait type that exists in the HA space for SQL Server”, then I realized maybe this isn’t the case… So, I pondered over this question, “is it truly misunderstood?” and came to the (possibly incorrect) realization that it is quite accurate in the general SQL […]
Access Violations (AV) are another common error that will cause SQL Server to take a memory dump. These can occur for a variety of reasons, and unlike the last one (Non-Yielding Scheduler) it’s quite the task, especially given public symbols don’t have structure data and offsets. Citations and Fines Access violations occur because a region […]
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, […]
