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DEFWAKEUP status in sysprocesses with waittype = 0x0000

Posted on 2004-04-21
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I am getting DEFWAKEUP status in sysprocesses which tells me that the SPID is waiting on a resource, yet the waittype = 0x0000 and the lastwaittype = MISCELLANEOUS.

Any clue about what the SPID is waiting on?

Thanks,
Rick
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Expert Comment

by:arbert
ID: 10878709
Any backups or scheduled jobs running?  
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by:essentialdatasolutions
ID: 10878850
No backups or scheduled jobs are running.
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by:arbert
ID: 10879363
Is this process using a paralell plan?  Multiple ECIDs for the SPID you're looking at?
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by:arbert
ID: 10879674
Usually on a parallel plan, you'll see a CXPacket wait.  HOWEVER, you can also see a defwakeup if one of the threads happen to be contending with another thread of the same process.
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by:essentialdatasolutions
ID: 10880277
It is a parallel plan with Multiple ECIDs
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arbert earned 750 total points
ID: 10880428
Ok, that's what it is then....

Is this a query you can run in analyzer?  If so, run the query and at the end add

option(maxdop 1)


See if you notice any difference.  However, the waits are just a nature of the parallel plans.
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Author Comment

by:essentialdatasolutions
ID: 10880804
The query is a stored proc that is rather complex with nested procs and some cursors.  Earlier I wanted to add the maxdop 1 to take out the parallelism but this would involve adding it to several dozen queries.  I decided to investigate the DEFWAKEUP without a waittype first.

Thanks,
Rick
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Expert Comment

by:arbert
ID: 10881425
You can also go into the server properties and up the value used to figure out when to use paralellism....
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