Creating Minidumps In SQL Server

Joe Obbish shows how to read the call stack by creating a minidump:

We can use minidumps to generate small files that contain SQL Server call stacks. Note that if you aren’t careful you can end up writing the full contents of memory to a dump file. I believe that writing the file is a single-threaded process, so this can take hours and hundreds of GBs on a real server. Also SQL Server is frozen while the dump is happening, so don’t do it in production.

Dumps are most useful when you want to examine a long running, very simple query or a query that seems to be stuck at a certain point. They aren’t useful to see a full call stack of a non-simple query or to see something that happens just once during execution, like a specific task during query compilation. All that you can get is a snapshot and the snapshot may not contain the information that you’re looking for.

There are multiple ways to generate and read dump files. For this blog post I’ll be using sqldumper.exe and WinDbg.

Click through to read the whole thing.

Related Posts

Running The Azure DTU Calculator On An Older Server

Jim Donahoe shows us how to get the Azure DTU calculator running on an older server without Powershell: I recently had to do an analysis of a client’s database workload using the Azure DTU Calculator(DTU Calculator) and thought it might be interesting to share just how I did that.  I have run this tool numerous […]

Read More

Finding Database Files In The Wrong Folder

Matthew McGiffen has a script which shows which database log and data files are outside of the default folder for that instance: One common issue that bugs me is where databases have been moved from one instance to another, usually through backup and restore, and the files haven’t been moved as part of the restore […]

Read More

Categories

September 2017
MTWTFSS
« Aug Oct »
 123
45678910
11121314151617
18192021222324
252627282930