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Description:
This wait is when a thread is setting properties for an OLE DB connection.
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Added in SQL Server version:
2008
Removed in SQL Server version:
N/A
Extended Events wait_type value:
The map_key value in sys.dm_xe_map_values is 483 in 2008 and 2008 R2, 531 in 2012, and 547 in 2014 RTM. After 2014 RTM, you must check the DMV to get the latest value as some map_key values have changed in later builds.
Other information:
I have not seen this wait type be a noticeable contention point.
Note that when a thread calls out to Windows, the thread changes from non-preemptive (SQL Server controls the thread) to preemptive (Windows controls the thread) mode. The thread’s state will be listed as RUNNING, as SQL Server doesn’t know what Windows is doing with the thread.
Known occurrences in SQL Server (list number matches call stack list):
- Setting the connection properties for a linked server
Abbreviated call stacks (list number matches known occurrences list):
- SOS_Task::PopWait+bc
SOS_Task::AutoSwitchPreemptive::~AutoSwitchPreemptive+72
COledbConnect::SetINITProps+fe7
COledbConnect::CreateSession+cab
COledbConnect::GetSession+38b
SpTestLinkedServer+241
CSpecProc::ExecuteSpecial+25b
CXProc::Execute+14e
CSQLSource::Execute+90e