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Running out of workers


Running out of workers

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dwilliscp
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Is there a way to set up a trace that will show why you are running out of workers?

I know that I will need to capture blocking, but is there a way to track the workers themselves?
GilaMonster
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What errors/messages suggest that you're running out of worker threads?

What version of SQL, what processor architecture, how many cores?

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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dwilliscp
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Unable to log into the server and ...

SQL Server Alert System: 'Out of Workers' occurred on <Server Name>

DATE/TIME: 7/17/2013 8:53:43 AM

DESCRIPTION: New queries assigned to process on Node 0 have not been picked up by a worker thread in the last 300 seconds. Blocking or long-running queries can contribute to this condition, and may degrade client response time. Use the "max worker threads" configuration option to increase number of allowable threads, or optimize current running queries. SQL Process Utilization: 0%. System Idle: 95%.


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dwilliscp
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IT will not allow us to use the SA account, so there is no way.. that I know of .. to get into the server when it is effected. Once you can get in.. my blocking query shows no problems, and running a listing of workers shows just the normal stuff.
GilaMonster
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GilaMonster (8/8/2013)
What version of SQL, what processor architecture, how many cores?


The DAC connection requires a sysadmin, not necessarily SA, so you should be able to use that to connect.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
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John Mitchell-245523
John Mitchell-245523
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This video talks about exactly the problem you're having.

John
Erland Sommarskog
Erland Sommarskog
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If you run out of workers, this is likely to be due to one of the following (or a combination thereof):

1) There are simply too many active users.
2) There are too many parallel queries.
3) You have set "Max worker threads" to a low value.

Erland Sommarskog, SQL Server MVP, www.sommarskog.se
dwilliscp
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GilaMonster (8/8/2013)
GilaMonster (8/8/2013)
What version of SQL, what processor architecture, how many cores?


The DAC connection requires a sysadmin, not necessarily SA, so you should be able to use that to connect.


When the Sql Server instance stops responding.. and I try to connect using Management Studio, it times out.

We are running 2008 R2 Standard, two CPU's with 6 cores each.
John Mitchell-245523
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Did you follow the link I posted to watch the video? You need to use DAC.

John
dwilliscp
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Erland Sommarskog (8/8/2013)
If you run out of workers, this is likely to be due to one of the following (or a combination thereof):

1) There are simply too many active users.
2) There are too many parallel queries.
3) You have set "Max worker threads" to a low value.


Worker threads are set to zero, default.
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