Hi,
I am monitoring the number of threads consumed by sqlservr.exe process. The thread count remains constant between 300-400 threads. Sometimes, I see that it jumps to 680+ threads and I am wondering what could be the reason for this increasing number of threads. I can see in sys.dm_os_threads that it creates around 300 threads in less than 1 second, but I do not find a way to follow up what created these threads. The thread count stays around 680 for 30 minutes. Then it goes back to 300 threads in some seconds. The database running on the server is an OLTP database that faces constant load in business hours between 07.00AM and 06.00PM. If the thread count increases, it is always in business hours. No maintenance jobs are running in that time.
It happened this morning and it happened yesterday afternoon; before that, the threads remain constant for more than 2 weeks.
Server: SQL Server 2008 R2 (x64) Standard, SP2 installed
Does anyone have an idea, how to find out what is causing this thread increase?
Thanks,
Bernd