Session-Level Wait Stats

Arun Sirpal points out that SQL Server 2016 has a session-level wait stats DMV:

This tells me about the waits since my last reboot or since a manual reset of the stats. It’s probably why you should do at least time-based analysis or reset the wait stats before starting, that is if you are interested in something time specific or if you want to understand certain workloads at a given time.

So the other option is that you could go down the session level route. With the session based analysis I took the query and changed it slightly to query sys.dm_exec_session_waits_stats and also pull back the session_id that I am interested in.

I had no idea this was available, and it’s something that I’ve wanted for a very long time, so that’s excellent.

Related Posts

When Faster Disk Increases WRITELOG Waits

Paul Randal explains that WRITELOG waits can potentially increase as you get faster disk: I was contacted last week by someone who was confused about the WRITELOG wait type. They were seeing lots of these waits, with an average wait time of 18ms. The log was stored on a Raid-1 array, using locally-attached spinning disks in […]

Read More

Performance Troubleshooting Plus Wait Stats

Jeff Mlakar builds up some thoughts on performance troubleshooting, including wait stats: Queries go through the cycle of the SPIDS / worker threads waiting in a series like this. A thread uses the resource e.g. CPU until it needs to yield to another that is waiting. It then moves to an unordered list of threads […]

Read More

Categories

January 2017
MTWTFSS
« Dec Feb »
 1
2345678
9101112131415
16171819202122
23242526272829
3031