Duplicate spids in sp_who
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Hi all.
I was looking through sp_who2 this morning and noticed something interesting
SPID Status Login HostName BlkBy DBName Command CPUTime DiskIO LastBatch
94 sleeping user server . Midbase EXECUTE 50700 44 08/26 10:23:25
94 sleeping user server . Midbase EXECUTE 30 44 08/26 10:23:25
94 sleeping user server 94 Midbase EXECUTE 20 44 08/26 10:23:25
94 sleeping user server 94 Midbase EXECUTE 10 44 08/26 10:23:25
94 sleeping user server 94 Midbase EXECUTE 30 44 08/26 10:23:25
How can the same process ID appear more than once. How can one process block itself?
Server is a 12 processor Itanium, 40GM memory running Server 2003 64 bit and SQL 2000 64 bit
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverabilityWe walk in the dark places no others will enter
We stand on the bridge and no one may pass -
Parallellised queries can show up as multiple rows in sp_who2. I have experienced that DBCC commands often do this.
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Thanks, that makes sense.
What about the self-blocking? It's not having any visible effects on the server, the commands aren't running for very long, though they do run often (They're an app checking of a 'queue' for records to process)
I'd like to add maxdop to the query in question, but the SQL is generated by an application and can't be changed.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverabilityWe walk in the dark places no others will enter
We stand on the bridge and no one may pass -
Sorry, no good answer for that I'm afraid. But I would probably guess it is more of a side-effect.
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